WANTED Long Bed Ford F-350 Camper

Hoping I might be able to find a camper for my F-350 8ft Long Bed! I have a 1997 (OBS) Ford F-350 7.3L Crew-Cab (4-Door) with a long bed. I know GFC makes the 8ft bed for Fords 1999 and newer, I figured with some ingenuity I might be able to get it to fit my 1997. I’m not exactly sure what dimensions differ between the models so if anyone has one on a 1999 or newer and would be willing to give me some measurements that would be rad too!