Cozmo, the wheels do not fit directly. The Tamiya brake hubs need to be modified ( opened up with a drill bit of the proper size -Donot drill or cut too deep into the plastic !). If the hub isn't deep enough for the large rims, you'll need to modify the suspension to make for the offset of the aftermarket wheels. Sometimes it goes very easily and sometimes very time consuming to get the suspension sitting properly with the right amount of camber, toe alignment.
For a source of rims go to HLJ's website. I think this site has been posted so many times when it comes to the subject of rims.
www.hlj.com
-Walter