OME Parts
OEM stands for Original Equipment Manufacturer. In the automotive world, OEM parts are components made by the same manufacturer that produced the original part installed in your vehicle when it left the factory.
For example, if you own a Toyota and need a new alternator, the original alternator may have been manufactured by a supplier such as Denso. An OEM replacement would be the same Denso-designed part that meets Toyota's original specifications. In many cases, the OEM part is identical to what was originally installed in the vehicle.