OER Parts offers a wide selection of Cooling System Components for your 1966 GMC K1000 Pickup. OER Parts offers 1966 GMC K1000 Pickup Water Pumps, 1966 GMC K1000 Pickup Chrome and Polished Pumps, 1966 GMC K1000 Pickup Electric Water Pumps, 1966 GMC K1000 Pickup High Volume Pumps, 1966 GMC K1000 Pickup OE Style Water Pumps, 1966 GMC K1000 Pickup Reverse Rotation Water Pumps, and 1966 GMC K1000 Pickup Water Pump Pulleys.