OER Parts offers a wide selection of Cooling System Components for your 1961 GMC 2500 Series. OER Parts offers 1961 GMC 2500 Series Hose Clamps, 1961 GMC 2500 Series Heater Hose Clamps, 1961 GMC 2500 Series Radiator Hose Clamps, 1961 GMC 2500 Series Tower Style Hose Clamps, 1961 GMC 2500 Series Heat-Shrink Hose Clamps, 1961 GMC 2500 Series Corbin Style Hose Clamps, and 1961 GMC 2500 Series Radiator & Heater Hose Clamp Set.