OER Parts offers a wide selection of Cooling System Components for your 1970 GMC C35/C3500 Pickup. OER Parts offers 1970 GMC C35/C3500 Pickup Overflow System Components, 1970 GMC C35/C3500 Pickup Hoses & Clamps, 1970 GMC C35/C3500 Pickup 3/8" ID Radiator Overflow Hose, 1970 GMC C35/C3500 Pickup Radiator Overflow Bottle, Hose & Cap Set, 1970 GMC C35/C3500 Pickup Overflow Hose Retainer Clip, and 1970 GMC C35/C3500 Pickup Overflow Hose Clamps.