Disc Harrow 1971 ford model j flex-o-hitch disc harrow/cultivator

[ike51]

ive got a 71 model j ford flexo-hitch with 3 piece clam shell bearing retainers and spools made from white cast iron they are breaking out in chunks it seems they are no longer available there are some aftermarket universal replacements from agi supply but the spools are for 1 inch square the model j has a 15/16 round gang bolt does anyone one on the site have any ideas or luck retro fitting these to a model j fleo-x-hitch harrow any help would be greatly appreciated. thanks wayne