They attach like other TCs, with a Cross-Pin, and the Hex slips right over. The Axle may be a little bigger, nothing a drill cant remedy though.highwayracer wrote:
If you can post pictures of the axles and the stock wheel, it would be very helpful. In addition, how much wider do you want your truck to be?
It uses Dog Bones, I believe. Its been a WHILE since I worked on it, and didnt pay attention when I was trying the Wheels last night. 
I'll have to see how much Thread is left after tightening the Axle Nut. Ive often thought of making some extra THICK Hexes, HPI already makes some huh? Interesting.
No specific number in mind for how wide I want it, just wider than it is using Standard TC Wheels, with a Wider Tire. For all I know, the Stock Wheels for it may be just what Im looking for.
Im on the Hunt.
