OER Parts offers a wide selection of Cooling System Components for your 1989 Pontiac Firebird. OER Parts offers 1989 Pontiac Firebird Overflow System Components, 1989 Pontiac Firebird Bottles and Caps, 1989 Pontiac Firebird OE Style Radiator Overflow Jars, 1989 Pontiac Firebird Stainless Steel Radiator Overflow Tank , 1989 Pontiac Firebird Overflow Jar Bracket, 1989 Pontiac Firebird OE Style Overflow Jar Cap, 1989 Pontiac Firebird Billet Aluminum Overflow Jar Cap, and 1989 Pontiac Firebird Radiator Overflow Bottle, Hose & Cap Set.