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This is the plug for the cylinder head exhaust chamber.  After removing the smog tube off your block there are holes on the back of the head that these threaded plugs fit right in to.  One plug per side; sold separately. 2 required per car.

Fits Ford Mustang Year: 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993        

Year Range: 79,80,81,82,83,84,85,86,87,88,89,90,91,92,93