MPN : Definition of a Manufacturer Part Number. A
manufacturer part number is a series of numbers and/or letters that has
been given to a part by the manufacturer. An MPN identifies the
part as belonging to and originating from that one manufacturer. Each
part the manufacturer makes has a different MPN.
To find the manufacturer part number
the customer can use search engines, look through the manufacturer's
catalog or website, or ask the customer service person at an auto parts
store for the name of the manufacturer and the MPN.