they are standard so you have to drill the holes for the 289
if you want to have it zero balanced it has to be machined
i bought them to fit my zf2 with a bellhousing of john wisher
but went for a brand new one so it´s a small flywheel i´ll count the teeth and give you the diameter or mayby someone know´s it allready and gives a reply
i´ll post some pic´s tomorrow
Frank