Car repairs and maintenance causes stress for many people. After all, is it possible to get a good part for your car and still get a good deal? There are two categories in the market that car parts fall into. One is Original Equipment Manufacturer (OEM) parts, and the other is aftermarket parts. Although they are both designed to replace a range of parts, from small components like side mirrors or light bulbs to larger parts like the engine or timing belt, they are quite different when you do a side-by-side comparison. Aftermarket parts are made by a third party, and there is no assurance that they'll fit your car correctly.