I have an original t-maxx Rx box thats going spare- never used it as my old FM rx was too large to fit inside & mount on my Gmaxx. I dont have dimensions, but can measure it up if you're interested- just pay S&H..
You guys are all awesome - thanks for the great info. I found a great box at the LHS this weekend made by RPM - basically a replacement for the Associated GT2. I'll post some photos of the install after I finish a couple things. It ended up working really well.