Sierra 18-2617 Mercruiser Outdrive Gasket SetFor Old Style Outdrives 1A/1B/1C And EZ Shift 1964-1966Kit Includes: (1) 18-2556 Drive Shaft Housing To Bell Housing Gasket; (1) 18-2840 Bell Housing Gasket; (1) 18-7153 O-Ring; (1) 18-7170 O-Ring; Replaces: Mallory; 9-62603; Mercruiser Stern Drive; 27-35996; 27-35996A1; Application:Mercruiser Stern Drive IA/IB/IC; 1964-1964; s/n 1684188 thru 1777798; IA/IB/IC EZ-SHIFT; 1965-1966; s/n 1776349 thru 2065189;