Have a 290 and a 390 both without flywheels. Having a hard time locating and purchasing same without a "new" purchase. Some of the other forums mention an adapter that was made by Bulltear in the past to mate a newer flywheel on the earlier flat ended cranks of the 67-70 era. Just wondering is someone knows of same or has any useful information, even possibly someone wanting to part with a flywheel. (I've done a few searches on the posts here and couldn't locate same) Cheers, Cam