1978 MACK WL - SERVICE BRAKES, AIR:ANTILOCK:INTERCONNECTING ASSEMBLY(WIRING) 1978 MACK WL - STEERING:LINKAGES 1978 MACK WL - SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS 1978 MACK WL - ENGINE AND ENGINE COOLING:ENGINE 1978 MACK WL - ENGINE AND ENGINE COOLING:ENGINE