The B-Max2 is pretty much bulletproof, but I think people would mostly like to have suspension parts, springs, some hardware, the chassis bolt-on parts and maybe some wheels or at least the Associated front axles; AE style wheels should be easy to source. The only thing I managed to break so far is one rear hub carrier, and I am certainly to blame myself for that...

I'm sure I won't need many of the parts that I have in my spares box, but as the car is currently not that popular (yet), it is always nice to have the parts handy. Just in case...