OER Parts offers a wide selection of Cooling System Components for your 1965 GMC 2500 Series. OER Parts offers 1965 GMC 2500 Series Water Pumps, 1965 GMC 2500 Series Chrome and Polished Pumps, 1965 GMC 2500 Series Electric Water Pumps, 1965 GMC 2500 Series High Volume Pumps, 1965 GMC 2500 Series OE Style Water Pumps, 1965 GMC 2500 Series Reverse Rotation Water Pumps, and 1965 GMC 2500 Series Water Pump Pulleys.