Outdrive Mounting Gasket Set for Alpha One, R, MR, or #1. Replaces Mercruiser 27-94996Q2 and 27-64818Q4. ** WILL NOT FIT Alpha GEN II models *** This specially designed gasket is designed for an Alpha One but has three slight perforations in the upper portion that permit you to convert to a #1 by trimming on the perforations. Great for marine mechanics -- only stock one piece to fit multiple applications.