These bellows are designed for the following MerCruiser applications: 165/170/3.7L/180/190/470/485/488 manifolds (1980 - 1989) Chevy 305/350/377 (1983 - up) Big block 454/502 (1981 - up) V6 229/262 (1983 - up)
After market Ref: MerCruiser 70981A3, Mallory Marine 9-72808, Sierra 18-2762, GLM 89070