I found an AGR Super Box 2 for sale, but it is for a Wrangler. Would it be possible to use it on a CJ? I think I read somewhere that the steering shaft will need to be replaced with a Wrangler one, but I'm not sure.
They make a superbox 1 and 2 for any Wrangler, the difference is the steering ratio in the 2. One is set up for offroad, with a better tuning radius, and the other is set up for more a street use which is a bit tighter for faster speeds.