727 low reverse band adjustment screw broken

I removed the pan off my 727 to service it. And found that the rear LOW/REVERSE band adjustment screw was broken !! The section of the screw that adjusts the band was still there. And the lock nut was still tight. But the head of the adj screw was gone !!
Are the 904s the same ??
anyone know the proper length ?
Anyone got a spare 727 low reverse adj screw ?