For 1968 & later Johnson/Evinrude 2-cyl, 50-55 Hp | 3-cyl, 60-75 Hp | V4, 85-140 Hp | V6, 150-235 Hp | V8, 250-300 Hp outboard gearcases.

also crosses with:
Sierra: 18-1714
GLM: 21135