OER Parts offers a wide selection of Cooling System Components for your 1969 Buick GS 350. OER Parts offers 1969 Buick GS 350 Molded Radiator Hoses, 1969 Buick GS 350 Upper Radiator Hoses, 1969 Buick GS 350 Lower Radiator Hose, 1969 Buick GS 350 Water Pump Bypass Hose, 1969 Buick GS 350 Oil Cooler to Radiator Hose, 1969 Buick GS 350 Throttle Body to Radiator Coolant Hose, and 1969 Buick GS 350 Universal Engine Coolant Plumbing Set.