4" Brake Drum & Steel Mini Hub Kit (1" Bore): Go Kart Parts: Racing Karts: Engines: Frames: Tires: Tips: Kits: Torque You are probably looking for period correct. But now would be the time to swap to a disc and go hydraulic. You can drill a hole or weld the puppy on since there is no keyway in the axle. Then just use the OldMiniBikes 1" hubs and weld them on or pin/weld them.If anything goes wrong with the differential you can swap the center sections easy enough.
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