Do you have any pics of the situation. The only thing you'll be able to do is custom fab some seat frames out of tubing, then bolt them to the frame. My buddy did that to his and it worked out fine.
build it, wheel it, break it, repeat
1983 CJ 7 (traded for TJ)
1992 YJ Renegade (sold)
1999 XJ Classic (daily driver)
1997 TJ Sport (building)