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