Here's a source for cross referencing Jaguar parts with potentially cheaper parts from other sources. It's mainly for Series I, II and III cars [listed in alphabetical order]
www.mich.com/~kroppe/jaguar/XJ_Parts.htm

The following list of parts sources is provided by Keith Owen of JCOH and Brett Gazdzinski and others. Brett used to be a frequent contributor to the old Modern section of the Jag-Lovers mail list.

All European Auto Supply | www.alleuro.com
Located in Royal Oak, MI
Phone: 800-255-3876
Phone: 248-399-9211
Fax: 248-399-9447
» New Jaguar parts. Best prices for Bilstein shocks and racks.

Antique Auto Battery | www.antiqueautobattery.com
Located in Hudson, OH
Phone: 800-426-7580
Fax: 330-425-4642
E-mail: info@antiqueautobattery.com
» The world's only manufacturer of hard rubber raised letter Antique Batteries licensed by The Big Three that offers complete coverage of accurate reproduction batteries for all models.

APA Industries | www.apaindustries.com
Located in Simi Valley, CA
Phone: 800-515-6438
Phone: 805-955-9699
Fax: 805-955-9699
E-mail: ApaIndustries@juno.com
» Replacement antenna masts and chrome bits and leapers. Extensive selection of wood, aluminum, leather and carbon fiber shift knobs.

AC Parts Online | www.acpartsonline.com
» All sorts of parts for your a/c

All Electronics Corp. | www.allelectronics.com
Located in Van Nuys, CA
Phone: 888-826-5432
E-mail: allcorp@allcorp.com
» Relays, electronics bits, etc.

All European Auto Supply | www.alleuro.com
Toll Free: 800-255-3876
» New Jaguar Parts, good prices on Bilstein shocks

British Autowood (Saul Chaplin) | www.britishautowood.com
E-mail: chaplin696@aol.com
» Wood trim refurbishing.

British Car Parts Company | www.britishcarpartsco.com
10525 Airline Drive
Houston, TX 77037
Phone: 281-448-5165
» Repairs. Service, Restoration, Parts

British Car Service | www.britishcarservice.com
Located in Tucson, AZ
Phone: 520-882-7026
E-mail: bcs@liveline.com
» Jaguar parts, component overhaul and restoration.

British Miles | www.britishmiles.com
Located in Morristown, PA
Phone: 1.800.933.4964 -or- 215.736.9300
Fax: 215-736-3089
E-mail: bmsales@britishmiles.com
» New, used and remanufactured Jaguar parts for all years and models.

British Tool and Fastener | www.britishwiring.com
Located in California
Phone: 805.528.0418
» Supply authentic Jaguar bolts with the familiar depressed center "dimple" to restorers. These are NEW bolts, not actual vintage bolts with specific markings. Most of those bolt manufacturers from way back when have long been out of business

British Wiring
Located in Illinois
Phone: 708-481-9050
Fax: 708-481-9050
E-mail: britishwiring@ameritech.net
» Jaguar wiring harnesses and connectors.

British Parts North West | www.bpnorthwest.com
Located in Dayton, OR
Phone: 503-864-2001
Fax: 503-864-2081
E-mail: bpnw@onlinemac.com
» New Jaguar parts for all years and models.

Carparts.com | www.carparts.com
Phone: 800-529-5003
» New Aftermarket Parts and Accessories

Classic Auto Spares (was H.D. Rogers) | www.classicautospares.us
Located in Bossier City, LA
Phone: 318-742-3651
Fax: 318-742-5044
E-mail: hdrsons@cox-internet.com
» New Jaguar parts for all years and models.

Classic Jaguar | www.classicjaguar.com
Located in Austin, TX
Phone:877-727-8524 -or- 512-288-8800
Fax: 512-288-9216
E-mail: sales@ classicjaguar.com
» Jaguar performance parts.

Coventry West | www.coventrywest.com
Located in Lithonia, GA
Phone: 800-331-2193
E-mail: cvwest@worldnet.att.net
» Good quality parts! Very knowledgeable. Coventry West is a 2006 sponsor of JCoH and very good people to deal with - Web Master

Deltran | www.batterystuff.com/battery/deltran/battery_tender.htm
» Sells a nifty battery charger that is claimed will not harm the battery if left on for extended periods. Ideal for those who store their cars.

Donovan Motorcar Service
Located in Lenox, MA
Phone: 413-499-6000
Fax: 413-499-6699
» Jaguar parts and restoration.

Eternity Wheels
US East Coast
Phone: 866-349-7467
» Remanufacturing / Refinishing Aluminum Alloy Wheels

Global Automotive Parts Access | www.gapa.com
Phone: 877-994-4272
» New Jaguar Parts

H. D. Rogers & Sons (see Classic Auto Spares - new name) | www.hdrogers.com
Located in Bossier City, LA.
Phone: 318-742-3651
Fax: 318-742-5044
E-mail: hdrsons@cox-internet.com
» New Jaguar parts for all years and models.

Import Parts Specialist, Inc. | www.ips-parts.com
Located in Boise, ID
Phone: 800-897-7278
» New Jaguar Parts

Jag Bits | www.Jagbits.com
Toll Free: 888-524-2487
» New Jaguar Parts

Jaguar Collector | www.jaguarparts4sale.com
Located in Massachusetts
Phone: 508-882-9524
» Jaguar Recyclers and Salvage

Jaguar Heaven
Located in Stockton, CA
Phone: 800-969-4524, 209-942-4524
Fax: 209-942-3670
» Used Jaguar parts for all years and models.

Jag Outlet | www.jagoutlet.com
Phone: 805-593-0524
» New and Used Jaguar Parts

Jaguar Services
Located in Illinois
Phone: 800-842-0912
» New, used, rebuilt parts for 1980 to 1997 models. Electrical diagrams available.

K300 Ltd
» Goodridge Hoses and Fittings Web Site: www.goodridge.co.uk/index.htm

Keyless Ride | www.keylessride.com
Phone: 877-619-3136
» New OEM Replacement Keyless Entry Remotes

Leatherique | www.leatherique.com
Phone: 904-272-0992
» Well regarded source of leather treatment materials.

Madera Concepts | www.maderaconcepts.com
Located in Santa Barbara, CA
Phone: 805-962-1579
» Wood trim refurbishing.

Metric and Multi Standard Components Corp
Phone: 888-966-6622
» All Types of Fasteners, Metric threaded rod for front spring pan removal

Midtown Auto | www.britishusedautoparts.com
Located in Syracuse, NY
Phone: 315-422-2187
Fax: 315-476-9421
E-mail: Midtown@twcny.rr.com
» New and used Jaguar parts for all years and models.

Momentum Jaguar | www.momentumcars.com
10150 Southwest Freeway
Houston, TX
Sales: 800-553-2128
Services: 800-548-2936
Parts: 800-553-2152

Motorcars Ltd | www.motorcarsltd.com
8101 Hempstead
Houston, TX
Phone: 800-338-5238. Ken Karr Ext: 626
Fax: 713-863-8238
E-mail: info@motorcarsltd.com
» New, remanufactured and used Jaguar parts for all years and models.

Mouser Electronics | www.mouser.com
Phone: 800-346-6873
» All sorts of electronics bits, including the speed control transistors in the blowers. No minimum order, many parts in stock.

Northeast British Parts | www.northeastbritishparts.com
Located in New Hampshire
Phone: 800-304-4516
E-Mail: sales@northeastbritishparts.com
» New parts and accessories

OSJI | www.osjimic.com
Located in Muncie, IN
Toll Free: 800-462-4244,
Phone: 765-286-4663
Fax: 765-287-9551
E-mail: mic@netdirect.net
» Original specification Jaguar interiors.

Park Place Jaguar | www.parkplacetexas.com (Houston's new Jaguar dealer)
13921 Interstate 45 North
Houston, TX
Phone: 832-249-2100

Fred Petroske
Located in New York
Phone: 315-649-2861
Fax: 315-649-4100
E-mail: petroske@gisco.net
» Used Jaguar parts for all years and models.

Rock Auto | www.rockauto.com
Good source for a lot of remanufactured parts

Shox.com | www.shox.com
Phone: 800-683-2890
» Shocks, Springs, Suspension, etc

Smothers Parts International | www.smothers.com
Phone: 800-550-1223
» New Aftermarket Parts

SNG Barratt USA | www.sngbarratt.com
Located in Manchester, NH
Phone:800-452-4787, 603-622-1050
Fax: 603-622-0849
E-mail: sales.usa@sngbarratt.com
» New and remanufactured Jaguar parts for all years and models. JCNA discount.

Stefan Roundy
Phone: 804-448-4371
E-mail: Stefanr@bealenet.com
» Used and some new Jaguar parts for all years and models. Located in Virginia.

Stew Jones Restoration | www.jaguarv12etype.com
Located in Winsted, CT
Phone: 860-379-1534
Fax: 860-379-2747
E-mail: stewjones@jaguarv12etype.com
» E-type parts and restoration specialist.

ThePartsBin.com | www.thepartsbin.com
Phone: 888-628-3247
» New Jaguar Parts

The Sport and Classic Car Company | www.britishcarpartsco.com
Located in Houston, TX
Phone: 281-448-4739

Terry’s Jaguar Parts | www.terrysjag.com
Located in Benton, IL
Phone: 800-851-9438
Fax: 618-438-2371
E-mail: jagsales@terrysjag.net
» MKII, E-type, XJ6 and XJS new and used parts

Thoroughbred Motors, Inc.
Located in Sarasota, FL
Phone: 941-359-2277 (Rodney)
Fax: 941-359-2128
» Used Jaguar parts for all years and models.

USAImportParts | www.USAImportParts.com
» New Jaguar Parts

Vicarage | www.vicarage-jaguar.com
Located in Miami Beach, FL
Phone: 305-866-9511
Fax: 305-866-5738
E-mail: vicarage@ ix.netcom.com
» Jaguar performance parts and remanufactured vehicles. JCNA discount.

Welsh Enterprises, Inc. | www.welshent.com
Located in Steubenville, OH
Phone: 800-875-5247, 740-282-8649
Fax: 888-477-5247
E-mail: info@welshent.com
» New, remanufactured and used Jaguar parts for all years and models.

Don Westerdale
Phone: 714-842-1208
Fax: 714-842-0715
» E-type parts specialist.

Wholesale Parts, Inc. | www.rustyparts.net
Located in Atlanta, GA
Phone: 800-741-5252 -or- 770-452-7320
Fax: 770-452-6477
E-mail: sales@rustyparts.net
» New Jaguar parts.

Wilco Supply, Inc
Located in Houston, TX
Phone: 800-521-5284 -or- 713-675-6366
Fax: 713-676-0201
» Custom fabrication of hydraulic hoses and fittings and brake and fuel lines.

XK’s Unlimited | www.xks.com
Located in San Luis Obispo, CA
Phone: 800-444-5247 -or- 805-544-7864
Fax: 805-544-1644
E-mail: parts@xks.com
» New and remanufactured Jaguar parts and restoration for all years and models.
JCNA discount.