Am having a similar problem, found these from America. Searching ebay for Colson 5 inch wheels yields similar results.
http://www.robotmarketplace.com/products/BPDWC16.html
edit: You'd have to melt a 3/8 nut in. Erm am having a go at making my own wheels in various ways lol. The cruder I make them the better they get somehow.




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