I TPI7 30O RPO DEFINITIONS A I E32 BODY EQUIPMENT STEEL SOUARE FORWARD CONTROL PANEL E33 BODY EQUIPMENT ALUMINUM SOUARE FORWARD CONTROL PANEL X88 CONVERSION CHEVROLET ZW9 BASE BODY OR CHASSIS Z88 GMC TRUCK I I O I 7 1992 GENERAL MOTORS SERVICE PARTS OPERATIONS LT TRUCKe53P 17 000 GROUP I 17 2 I E I