HERE
The Rear Axle pops right in, no mods necessary.
The Front wheels, however, needed a little working...But not much. The only thing that I needed to do was bore a little bit of a bigger hole on the travel arm of the wheels (click
HERE for a picture).
The next adjustment is to widen the front wheel wells, on the Bit bodies, to handle the larger wheels. But running the Bit with just the chassis, it goes in a straight line very reliably now!