What year is your Bike, I have the parts catalog for 04-06 and can try to find you the p/n when I get home tonight.I'm doing my winter service work on the bike and after draining the coolant and finding the "crush washer" somewhat deformed, I went to our local Honda dealer to get another, but they can't find it on their computer or match it looking at it! Their mechanic says "we don't even work on those here"! They have 4 goldwings on their showroom floor but won't work on 'em:wrong:, not that I'd ever let 'em work on mine! Anyway, does anyone have the part # for the coolant drain plug washer? They say if I can find a part #, they may have it!