I don't know if this will help or not, but I too looked endlessly for some kind of box, and resorted to building my own wheel well boxes, and thankfully found this:
it fits with the half an inch of room on each side. Made by DEEZEE. Less than $100.
'94 YJ: 4.0L HO fi, 5-speed AX-15, Daystar 1.25" shackles, 17" JK wheels, lined tub, custom paint, Bestop Supertop, etc..
'88 YJ: 4.2L carb, 5-speed, stock everything. Banana-ish yellow. hard top. 26,XXX original miles.