Vertex Top End Gasket Kit KTM SXF450 16-22/EXC450 17-23/Husqvarna FC450 16-22/Gas Gas MC450F 21-23 Product Info: Vertex’s top end gasket kits are designed for tackling the job of replacing a piston. Each set includes the head, base, exhaust pipe, and power valve gaskets necessary for a top-end rebuild. Formed rubber valve cover gaskets are not included. Multi cylinder applications include all necessary components to rebuild all cylinders.