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Stock 86-87 58MM Throttle body gasket kit We offer a complete throttle body gasket set made to the exact specs and using the same material as the 1986-1987 Turbo Regal original gasket. This isimportant since any vacuum leaks can contribute to a rough idle. Now you can have the entire throttle body gasket set in one kit. This specialty kit includes the IAC sensor gasket to throttle body, throttle body to upper plenum gasket, vacuum block gasket, and IAC housing to throttle body gasket. We offer this 4-piece throttle body gasket kit in two sizes: Original stock 58 mm size and another for the larger 62-65 mm ported throttle body we carry.