THROTTLE BODY GASKET KIT GM TWIN 58MM FOR BBK THROTTLE BODY 1536-1539-1542-1544. Title:BBK THROTTLE BODY GASKET KIT GM TWIN 58MM FOR #1536-1539-1542-1544. Premium Graphite Material - Twin 58mm. All throttle body gaskets should be changed when you suspect or there is evidence of a leak.
