Just to compound the situation: there is the Toyota 4x4 box.
I have done a GM box on a 55.2 and it worked very well. I made all of the mounting plates myself. I inset the plate into the frame to provide more tire clearance when turning to the right. Even so, I still had minor tire rubbing in a right turn. Just something to be aware of. This may not be an issue on an AD because of the tapered frame.
