For 1976-2011 Mercury/Mariner 2-cyl, 35-40 Hp | 3-cyl, 40-115 Hp | 4-cyl, 90-115 Hp | 6-cyl, 200-350 Hp | V6, 115-300 Hp outboard gearcases.

also crosses with:
Sierra: 18-2316-9
GLM: 30030