MC04 012 21 8 900 BOLT HEX W CON WA M8X1 25X21 5 17 OD 92 93 3 8656392 18 5 THD PC 9 8 PARK BRK LVR REPA R FOR n STUDS RPO DEFINITIONS JM4 BRAKE SYSTEM POWER FRONT D SC REAR DRUM ANTI LOCK CAST IRON 4 1993 GENERAL MOTORS SERVICE PARTS OPERATIONS OLDSMOBILE 32C 4 0 00 GROUP 4 180 2 93