MerCruiser Sterndrive Alpha 1 - Lower Housing Products Replacement Mercruiser Alpha Sterndrive Lower Unit #SEPPT116L $1,075.00 Complete Lower Housing - Counter Rotation, Replacement for Alpha Gen II #SEPPT116U $1,275.00 NOTE - A separate installation kit needs to be ordered along with these lower units due to the increased flange thickness versus the standard OEM product.