These Gas Gas system kits are machined for each application which generally takes 3-4 business days to process. The system kit will include a replacement factory Gas Gas Stator, Gas Gas Rotor( flywheel) and Gas Gas Ignition Coil. All parts in the kit need to be installed at the same time. All parts look different than stock but are bolt-on. The new flywheel Rotor does use a keyway. Be sure to leave your specific year make and model in the order notes.