I recently purchased a old burch 6' disk. i can not find any info for getting replacement parts. Not sure of the year model, the tag on the 3 point hitch has a s/n 32771. It also says Burch True Blue. The disk gains do not fasten solid o the frame, they have a round hook on the frame that hooks into the outer bearing housing (looked to have babbit bushings instead of bearings) on the inner up top there is a 1"x1/2" flat bar that slides into a slot. There is 3/4" round rods with hooks that fasten the front gains to the rear. Does anyone have an idea of the year or where to get replacement parts(bushings)?