ummm......I went the other way and bought a '93 long bed cap for my '90 and it's a few inch's too wide at the cab but fine at the tailgate, it works but looks a bit goofy, had me scratching my head so I went back and measured the '93 front and back and the box is wider at the front, to match the wider cab I guess and then narrows to the tailgate, I'll measure some gen 3's next wrecker trip, maby I'm suffering from heat stroke.