1978 Mack RD685S, Truck Trailer, Interior Misc Parts, Fits to: Mack RD685S, (Used) 1978 Mack RD685S, MISCELLANEOUS DASH SWITCHES- Controls: Wiper Arm, Washer Fluid, Parking Brake, Trailer Air Release., Truck Year 1978, VIN RD685S3685, Material Plastic RD685S3685