http://www.customrccars.com/product_...at=22&custom=0

That should be the stock body. I've dealt with www.customrccars.com and www.headrushhobbies.com a lot for funfactor parts and they are both very good.

BTW: the ATX is discontinued, but the Talon is not. They are almost the same unit. The main differences are the talon has: longer chassis, longer front drive shaft, narrower fuel tank, top chassis brace (2 pieces), laid down steering servo, longer body. So any other parts should work on your ATX, somtimes you can get cheap talon parts on ebay.

FYI: The ATX is from the "funfactor" series which includes a monster truck, stadium truck, rally car, and buggy. its pretty easy to convert from one to the other, the MT/ST just have longer CV shafts/dogbones, longer A arms, and different wheels.

These units can use a few upgrades, but they are pretty fun and EASY to work on. Check out this thread if you want to see what can be done to a funfactor http://www.rcuniverse.com/forum/m_3083513/tm.htm