There is a lot of different flywheels, all for 1961-63 F-85’s. They very in weight from ~20# to 34# depending on the application. Once you find a suitable flywheel you will then need a clutch disk and pressure plate to match, not easy to find either. Attached is a list from the parts manual and some weight/application data. D&D might seam spendy but you will get the correct parts that will work with your engine/manual transmission.