Aftermarket collision parts also referred to as 'non-OEM parts,' 'imitation parts' or 'copy parts' are parts produced and supplied by companies other than the original equipment (OE) manufacturer; in other words, non-OEM collision parts.

A single car has about 30,000 parts, counting every part down to the smallest screws, nuts and bolts. Some of these parts are made by the manufacturer, but there are lots of suppliers that make many of these parts. The 30,000 or so parts use different raw materials and different manufacturing processes.

An aftermarket part is any part for a vehicle that is not sourced from the car's maker. If the parts are direct replacement parts, they will not void your car's warranty. A number of companies make parts designed to function the same, or in some cases even better than the original.