B23 23-36183 Mercury Quicksilver Mercruiser Oil Pump Drive Shaft Coupler Guide. Retainer. Shaft Guide Nylon Fits MCM/MIE GM V-6 & V-8 (283, 305, 327, 350, 454 & 502 cid) engines. New Old Stock - not in original packaging. Please verify that the part number is correct for your application. Thank you.