I looked into this awhile back for my citabria cause i found a good used set of 26" bushweels on ebay. You need the heavy duty brakes, and hd axles(scout axles). call Wup at alaskan bushwheels, he has everything. i do see scout axles for sale on barnstormers from time to time, otherwise i think they run $500. the brakes are about $1,500 or so.
Nathan