Replaces OEM part #
- MERCURY MARINE 45-41939F1
- MERCURY MARINE 45-41939A1
All Mercruiser #1 units S/N 2791957 & above except MR/Alpha units or units which have been retro-fitted with MR/Alpha lower units. Also for 165 (6 cyl) S/N 2763442 & above.
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