Yamaha hardware has always been a little different with oval bushings and oversized flanges on some bolts. We have you covered with the YZ/YZF Pro-Pack. This kit contains 190 pieces of OEM style hardware in factory style & finish including: factory style aluminium bushing for the bodywork shroud bolts seat bolts sub-frame bolts fork guard bolts rotor bolts a full set of sprocket bolts t-nuts rim lock spacers valve stem grommets & caps chain adjuster screws Fuji lock nuts pan head screws M8 and M6 flange bolts and drain plug washers. Fits: Yamaha WR250F 2014-2019 WR450F 2014-2021 WR450FSP 2021 YZ250F 2014-2018 YZ250FX 2015-2017 2019 YZ250X 2016-2017 2019 YZ450F 2014-2015 2017-2019 YZ450FX 2016-2018