I still race my old B2 buggy and unfortunately no B4 parts can be used on the B2 (ok, ok, except, bearings, screws and so on...)
However almost all B3 parts are compatible, I know it's already old, but you can find them less harder.
Only a couple of notes:
- The B3 front suspension arms fits with no modifications, but only if you change both, because the front cross brace is forwarded.
- The B3 rear suspension arms fits, but you have also to change the rear hub carriers (because the arm is longer and the hub have a different offset). No need to change the cvd/dogbone .
If you know a good Thunder Tiger (AE) shop you can also search the spares for the AT-10 Phoenix buggy, actually a re-branded RC10B3
!
Bye
Emanuele