From Wikipedia, the free encyclopedia
A Regular Production Option (RPO) is a General Motors standard coding for vehicle configuration options. These codes are a combination of 3 alphanumeric characters and refer to a specific option or modification to the vehicle. These codes signify how the vehicle is built during production and thus the specific configuration of a vehicle as it exits the factory up to and including the paint color can be described by specifying the base model and the complete list of RPO codes used during production.....
The label(called a SPID label) is usually located in three spots.....back of the glove box door....the underside of the rear trunk lid....on the cover of the rear spare in the trunk...
Looks like this, with all RPO codes listed:
