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

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