I TXO5 047 RPO DEFINITIONS z X88 CONVERSION CHEVROLET ZR9 SYCLONE PERFORMANCE PACKAGE Z7O OLDSMOBILE BRAVADA Z70 Z79 TYPHOON PERFORMANCE PACKAGE Z88 GMC TRUCK Y t 1992 GENERAL MOTORS SERVICE PARTS 0PERATIONS LT TRUCK 53S t 1 92 5 29 5 000 GROUP