This is a set of 6 Grade 8 hex bolts, designed to fasten the flywheel to the crankshaft in all AMC 258 4.2L and 4.0L engines paired with manual transmissions. **For 4.2L engines, it fits:** - 1972-1983 CJ5, 1976-1986 CJ7, 1981-1986 CJ8 Scrambler, 1987-1990 Wrangler YJ; - 1972-1973 & 1980-1983 Wagoneer, 1974-1987 J10, 1974 & 1976 J20; - 1984-1986 Grand Wagoneer, 1972-1973 Commando, 1974-1983 Cherokee. **For 4.0L engines, it fits:** - 1991-1995 Wrangler YJ, 1997-2006 Wrangler TJ; - 1987-2001 Cherokee XJ, 1987-1992 Comanche MJ; - 1993-1994 Grand Cherokee ZJ, 1987-1990 Wagoneer. It also works with AMC 304 5.0L, 360 5.9L, and 401 6.6L engines installed in CJ and SJ models. A high-quality factory-direct replacement part, it replaces Mopar J3170524. **NOTE:** These are specifically flywheel bolts for manual transmissions, not flexplate bolts for automatic transmissions.