I just used the stock decals. They're not Lightning but they look real nice. I'll try to post a pic.

 

your right about the 21rg and frame.good eye.thats one of my babys .did alot of custom,right down to working dash lights etc...took a couple 1stplace concourse.the body was special ordered from a local hobby store.its from tamiyas lightning kit.you can order the body seperatly for about 30 dollars.IT COMES WITH A DETAILED SHEET OF AUTHENTIC LIGHTNING STICKERS >AWSOME

 

I might have to see if i can get those decals from tamiya...im trying to make my truck look just like mine, without all the regular R/C decals and so forth.