OER Parts offers a wide selection of Air Conditioning and Heater Parts for your 1968 GMC C15/C1500 Pickup. OER Parts offers 1968 GMC C15/C1500 Pickup Air Conditioning and Heater Control Panels, 1968 GMC C15/C1500 Pickup Air Conditioning and Heater Knobs, 1968 GMC C15/C1500 Pickup Air Conditioning and Heater Levers and Cables, 1968 GMC C15/C1500 Pickup Air Conditioning and Heater Relays, 1968 GMC C15/C1500 Pickup Air Conditioning and Heater Switches.