For 1964-78 Johnson/Evinrude 2-cyl, 9.9 & 50 Hp | 3-cyl, 65-70 Hp | V4, 85-140 Hp | V6, 150-235 Hp outboards.
ID: 1.1875″ | OD: 1.375″ | W: 0.08375″

also crosses with:
Sierra: 18-7156-9
GLM: 81230