For 1977-98/2001/2003-10 2-Stroke & 4-Stroke 1-cyl, 4-6 Hp | 2-cyl, 5-8 Hp outboards.
Hub uses key
ID: 10 mm | OD: 41 mm
W: 14 mm | 6 blades

also crosses with:
Sierra: 18-3097
Mallory: 9-45504