You can also use a RCI 2161 fuel cell, cut a hole in it and use your stock pump and sending unit.
This cell fits nicely behind your rear seat.
The only problem is the pump does not sit on the bottom of the cell, so you can not access all the fuel.
I fixed it by extending the tubes on the sending unit so that the sock sits on the bottom of the cell.
Do a search there are alot of writeups on the forum and on the web.
93 YJ SOA 2" springs front, XJ springs rear w/main leaf added, High pinon 9 inch rear detroit locker front Dana 44 ARB 4.56 Gears, 36 inch Irok tires too much to list. www.mijc.org