For 1968 & later Johnson/Evinrude 2-cyl, 5-35 Hp | V4, 65-100 Hp outboards.
ID: 0.4375″ | OD: 0.625″ | W: 0.09375″

also crosses with:
Sierra: 18-7180-9
GLM: 81110, 45030
Mallory: 9-76556