- Replaces Mercury OEM 43-18411A2, Sierra 18-2201
- Compatible with MC-1, MR, Alpha One and Gen 2 (1970 -
1997) models
- For upper unit models with serial numbers 3106717 - 0K999999
- Compatible with V8 models with 1.50/1.47
ratio (20/22 teeth)
- Includes bearing GLM P/N 21560 (OEM 31-32573A1)
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