For 1980-2004 Johnson/Evinrude 2-cyl, 4-8 Hp outboards.
Hub uses key
ID: 11.2 mm | OD: 38.4 mm
W: 17.9 mm | 6 blades

also crosses with:
Sierra: 18-3091
GLM: 89500
Mallory: 9-45214