Regular Production Option

Coding for vehicle configuration options A Regular Production Option (RPO) is a standardized three-character alphanumeric code used by General Motors to designate vehicle options and modifications since at least the 1950s (see Corvette C1). RPO codes could be considered the "genetic codes" of a vehicle, since the complete configuration of a GM vehicle (as it exited the factory) can be described by specifying its year, base model, and all its RPO codes. Vehicle records have been digitized into GM's electronic database since at least 1990. Some dealerships are willing to print a vehicle's RPO list (with definitions) using its VIN. Alternative Option Codes Three-digit all-numeric Sales Codes were used on order forms and sometimes on window stickers. The 1960–68 models' Cowl Tags sometimes used two-digit Group Accessory (ACC) codes (format #@, where @ = 1 through 5). Where Used RPOs have appeared on/in several records, including: dealership order forms/invoices assembly plant instructions (Production Broadcast Notices, aka Build Sheets) Fisher Body number plates (aka Cowl Tags, ~1929–84) vehicle window sticker Protect-O-Plates (1965–72), Ident-O-Plates (1963–64 Pontiac) SPID (S