Yamaha Style M9x18 Aluminum Collar Bushing is used to on many models of Yamaha dirt bikes 2006- current models. The radiator shrouds for 2003 to 2005 YZ 250F/450F & 2003 to 2006 WR 250F/450F models These bushings only came with the OEM shrouds and were never offered from Yamaha unless you bought the shrouds. These fit Yamaha shrouds #5TA-21740-00-00 and #5TA-21730-00-00 and replaces part 5BE-21749-00-00. Collar standoff of 4mm x 12.6mm diameter. Sold individually.