With the bearing hangers that thing has in the rear, standard go-kart bearings, and reatiners, along with a 1" kart axle will all bolt up. I don't know if this site has a vendor for ole skool kart stuff, but American Powersports is a good vendor for Azusa axles, bearings, retainers, and hardware such as that...
The azusa "flex proof" axle is at the top of it's class for an installation like that. There are cheaper axleas, but I've never had any last through the abuse a flex proof will...
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kliff
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