Not sure if you're talking fastback , but,,,,When I bought my shell there was no interior and all the seat mounts were cut out and the rear was carpeted at one time. I knew I was putting buckets in the rear and modified them accordingly. The dilemma was the rear area. I welded up a frame and made a rear deck and modified the sail panels to fit. the "down legs" in front of the well were trimmed to fit and the tubs carpeted between the seat back and wall.The drop down panel still works and opens up to the original rear floor panel.