Ahh, I forgot all about the Tamiya Blackfoot tires! Those might be perfect for the front tires, as I believe they are smaller then Clodbuster tires. Also consider Tamiya TLT-1 or Wild Willy V-treaded tires. They are about the same size as the Blackfoot tires, but standard V-treaded, like the Clod's. While I'm thinking about it, another company named Imex made a Clod tire that is more industerial treaded. Road Hawgs, I believe is the name. Sometimes called Imex Pullers. They are slightly smaller in diameter then the Tamiya chevron tires, but very close, with the proper tread, if not a bit wide spaced.
Also look at this page. The jumbo kongs could work for rear tires, and the chevron standard size for the fronts, maybe?
http://www.imexrc.com/servlet/the-Ti...res/Categories