Stay away from the Kory stuff.
I know of 3 of those gears that have had welds fail. Including mine, that had the tongue come unwelded from the steering assembly on the road. it is rather unnerving when a full gravity box just disappears from your rear view mirror! It didn't flip, and I got it off the road by pulling into a neighbors drive and kicking the front tires to get them to turn.
Others I know have broken the weld off of spindles, gotten new gears with NO grease in the wheel bearings, etc.
High school shop classes could have turned out better products. There is a reason even Farm and Fleet doesn't carry their stuff anymore.