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Here is the last of the NOS 5" Go Power wheels from the stock I was able to get- these are all made for tapered roller bearings, but they would easily lend themselves to having inserts turned on a lathe and shrunk-fit to make a complete set of front and rear wheels for your vintage kart for a fraction of the price of a new set. Or you can use them as-is on minibikes, or as front wheels only on a kart.
These have never been mounted or used and just have shelf-wear on the paint.