4 4AO5 001 RPO DEFINITIONS JA2 BRAKE SYSTEM HEAVY WE GHT D SC DRUM JA8 BRAKE SYSTEM MED UM WE GHT D SC DRUM J41 BRAKE SYSTEM POWER FRONT D SC REAR DRUM CAST IRON N91 COVER SIMULATED WIRE WHEEL NCLUDES LOCK PC6 WHEEL 14X5 5 L GHT METAL ALLOY PC7 WHEEL 14X5 5 STYLED PA NTED PG4 WH EEL I4X5 5 ALUM NUM I 1 1993 GENERAL MOTORS SERVICE PARTS 0PERAT ONS BU CK 45A I5 93 5 7 5 006 GROUP