If you have any concerns regarding the suitability of the item please ask before purchaseCASTLE NUT & COTTER PIN FOR YAMAHA OUTBOARD6 8 9.9 15 HP2 & 4 STROKE MODELSReplaces Yamaha part number : 90171-10m01 / 92990-16200ALL PARTS ARE IN U.K. STOCKCOLLECTION IS AVAILABLE FROM OUR LEIGH -Manchester Unit / WorkshopOpen Monday to Friday 9 am to 5 pmSSI MARINE

If the part looks the same like yours is not always the right one for your outboards so please double check.