For those of you who must have OEM this is a genuine Yamaha washer nominally 8mm ID, 15mm OD and c. 1.5mm thickness. No rust, and in good condition. Price is for one. Fits far too many Yamaha motorcycles to list here, and if you are reading this you have almost certainly put the part number into eBay so it fits your Yamaha as well! Please note that free UK postage and the reasonable cost that I charge for international postage does not include tracking.