The PERRIN crank pulley hub is built for Subaru FA and FB engines and supplied as the hub-only option with a smaller outer diameter. It is intended for applications where a hub replacement is required without the outer pulley assembly. This hub matches the Perrin specification for FA/FB engines and is provided as a direct replacement component.
PERRIN Subaru FA/FB Engines Crank Pulley Hub Only (w/Small OD)