Wouldn't it be cheaper to get those parts individually on ebay? Jenny's RC, Dollar Hobbyz and Lumidave are a few that I always see parting new trucks out, Dollar Hobbyz is where I got my parts from when I had to rebuild. You should be able to get all of that for a lot less, you could probably convert it to a XXL and still have a little change. I think if you hit ebay you could get everything in that kit, minus the wheels, arms and inner gear cover with enough $ left over to get the RPM arms and gear cover insyead of the stock. The only hard to find part from that kit (from what I've heard) are the wheels. Just my opinion though. Also what is the difference in the side rails?