Yamaha Blue M6x18 Aluminum Collar Bushing was used to mount the OEM rear fender on 2010 to 2013 YZ450F models. This beautiful blue anodized Specbolt part has a collar standoff of 4mm x 10mm diameter. Before now, it was never offered alone and only available when you buy a new OEM rear fender from Yamaha. Part # 33D-21610-00-00 or 33D-21610-10-00. This bushing is very universal and therefore can be used for almost any plastics mounting application.