- KYB Corporation of America
 - Lombard - Manufacturer of shock absorbers, struts and hydraulic components. - SplitFire, Inc.
- Northbrook - Offering SplitFire spark plugs.
- WeatherTech Automotive Accessories
- Downers Grove - Offers auto accessories such as all-season car mats, wind and rain deflectors, and cargo liners.
- American Van Equipment
- Itasca - Van and truck equipment solutions for the commercial user.
- Lovejoy, Inc.
- Downers Grove - Producer of power transmission components, including all types of couplings.
- Heidt's Hot Rod Shop, Inc.
- Wauconda - Providing custom-engineered suspensions and other parts and accessories for your 1930-1970 vehicle.
- BWD Automotive@
- Midwest Truck & Auto Parts Inc.
- Chicago - Manufacturer and wholesaler of heavy and light duty transmission components. After market replacements for many brand names.
- A&B Automotive Center
- Chicago - Specializes in electronic and custom accessories including mobile video, remote starters, alarms, window tinting, paintless dent removal.
- GetAGauge
- Homewood - Offering tire pressure gauges and accessories.
- ABC Auto Parts
- Blue Island - Sells and installs recycled auto parts.
- Automotive Rebuilders Supply Company, Inc.
- Chicago - International/domestic wholesale buyer and supplier with a large inventory of gas/diesel engines, transmissions, rear ends, and all small parts.
- Kold Ban International
- Lake in the Hills - High pressure starting fluid (ether) systems. In addition KBI offers engine and component testing.
- Fun Projects, Inc.
- Saint Charles - Manufactures parts and accessories for antique car restoration, especially Fords.
- Liberty Leasing and Equipment Company, Inc.
- Peotone - Rent or lease for long or short term trailers, forklifts and miscellaneous equipment.
- G.H. Meiser & Co.
- Posen - Maker of precision tire gauges for cars, trucks, motorcycles, and bicycles, including the AccuGage brand.
- Future Automotive
- Wheeling - Manufacturer-direct warehouse of automotive aftermarket replacement parts and supporting chemicals and installer aids.
- Hubcap Center
- Alsip
- Citroen Auto Parts
- Chicago - Chicago-based dealer of replacement Citroen parts.
- Blizzard Snow Plows
- Bolingbrook - Selling snowplows and accessories.
- Fox Ent. Inc
- Saint Charles - Sells Weatherboot well liners (floor mats).
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