SEI Marine SE106 MerCruiser Alpha One Gen 1 Lower Unit (All Ratios)

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SEI Marine SE106 Lower Unit – Replaces MerCruiser Alpha One Gen 1 (All Ratios) Replaces MerCruiser R, MR, and Alpha One lower units from approximately 1972–1990. Works for all gear ratios (13/21 tooth count) 13-spline driveshaft Rated up to 300 HP Covered by SEI’s 3-Year No-Fault Warranty Ships from Florida warehouse Direct replacement – no modifications needed Show more