Shop by Brand Mercury OutboardBearing Back Needle Bearing 31-160521 Viewer:276 OEM No.:31-160521 For Mercury outboard 9.9, 15, 18 HP 2 & 4 Stroke You May Also Be Interested In Needle Bearing 31-803675/803675 Bearing Assembly 31-884330T01/884330T01 Pinion Gear 43-161382/161382(13T) Piston Kit 6K5-11631-03 STD