I found a pretty good site that said the Land Jump, Vanning, TT Silver Fox, and a Varicom version were all manufactured by the same company back in the 80's. I dont know if thats true...but most of the parts do seem interchangable.
Kyosho,Thunder Tiger, Varicom and Bluebird parts were made in the same outside factory. The above Silver fox (green edition) roller is in good shape worth the $140 for sure. The fuel tanks can be found but locating front bumper is rare. I sold a ton of new silver fox parts to landjump.net and has many folks asking me for front bumpers and front bulkheads.