The XJ tank goes from side to side under the hatch, pre 97 tanks had a pump that mounts in like the mj pump but is an exact mirror physically and resistance for float arm is backwards and had a fuel return lines. Post 97 tanks had fuel pumps that mount in from the top but still go from side to side under the hatch but eliminated the fuel return line. I've seen some people in the past swap in dakota tanks when they did the 97+ swap and reported good success with the fuel sender and mounting, so I'd recommend searching dakota tank on here to get ideas from that.