OE Number – also referred to as Original Part Number, Genuine Part Number, or Factory Part Number, identifies the complete component or sub-assembly originally installed by the vehicle manufacturer. This number ensures exact compatibility with the vehicle and is commonly used for sourcing replacement parts, verifying authenticity, and maintaining OEM (Original Equipment Manufacturer) standards. Essentially, it serves as the manufacturer’s reference code for the part, helping technicians and buyers confirm that the component matches the original design, quality, and fitment of the vehicle.