That is a Team Losi NXT.
Came after the GTX; the rear shock tower was different and a couple other small things; all parts between the GTX and NXT are indeed interchangeable (though maybe a touch different, mainly the rear tower and I think rear toe blocks and slipper assembly).
Very tough trucks.
Doesn't look like you need much other than a receiver pack, fresh fuel tubing, a transmitter/receiver, and some shock oil to finish it out...and maybe a body.
I don't remember if any other bodies interchanged with it or not.
Ebay is a great source for small parts. Search "losi gtx" and "losi nxt" and there's still a few parts floating around.
If you just need a few small service parts; PM me a list of what you need and I may have it on hand. I have a lot of small parts for these trucks
http://cgi.ebay.com/VINTAGE-LOSI-GTX...item2304e66ce9