Produced in the U.S.A. with the latest materials and technology in gasket production to Vertex specifications. Vertex gaskets ensure long-lasting performance and leak prevention for your rebuild needs. Vertex's replacement gaskets and seals are available as top-end kits, complete engine kits, or as an oil seal kit. These sets include the head, base, and exhaust gaskets, valve seals, O-rings and other gaskets to complete a top-end rebuild. Fits: Yamaha WR450F 2019-2020 YZ450F 2018-2019 YZ450FX 2019-2020