For 1985 & earlier Mark & Mercury/Mariner 2-cyl, 40 Hp | 4-cyl, 65-85 Hp | 6-cyl, 100-150 Hp outboards.

also crosses with:
Sierra: 18-5836
API Marine: SW78
ARCO: SW661
GLM: 72480
Mallory: 9-15103