It seems there's a solution for everything in Japan. Companies like TN racing make nice products that have you scanning the hobby shops for house to figure out which variations within 2mm are going to be perfect.
Don't think it's an easy task either. Because they are mixed in among the Tamiya TT-01, TA05, Yokomo MRTC versions , Hpi, ABC Hobby, Square Sports, Suzuki etc.
Confronted with a wall of axles and hubs screws etc etc etc
You need to take a calculator. I didn't have one on hand, but I figured I had +6 of space under the Hpi Mazda rear with Yokomo tyres might work.
The new rear axles get the wheels way out there.
Thats +12 in width. I can imagine the diffuser breaking off, it's pretty fragile. Surviving so far.
Wheels are now perfect!