1978 MACK RL - SERVICE BRAKES, AIR:ANTILOCK:INTERCONNECTING ASSEMBLY(WIRING) 1978 MACK RL - SERVICE BRAKES, AIR:SUPPLY:HOSES, LINES/PIPING, AND FITTINGS 1978 MACK RL - ELECTRICAL SYSTEM:WIRING 1978 MACK RL - STEERING:WHEEL AND HANDLE BAR 1978 MACK RL - ENGINE AND ENGINE COOLING:ENGINE