the crossbars? the roof rails?
I want to say they are differently designed, could be wrong though. I know when it comes to a second gen, you can take the rails off, fill the holes and swap them for longer ones from something like an expedition, so that they extend across the whole roof. If ya got a junkyard nearby, can test fit 'em out there, usually what I do, if not I need to go out there at some point soon. If ya wanted to do the whole cross members and rails from a second gen, ya probably could, just not sure if the holes will line up, so ya may have to fill your current holes and drill new ones. But otherwise I don't believe the second gen cross members will fit in the first gen rails; as said, I could be wrong though, but I do believe you'll either have to modify those to fit them or just use second gen rails.
in the 2g iirc both crossbars can slide so neither is permanently bolted. that said, they look largely similiar, as there was no significant change from 1-2g. iirc in the 2g theres a screw in front and maybe back and the rest is held by rivets. that said there are probably differences one would nto find without dropping the headliner and measuring etc
They slide yeah, that's why many, myself included, will add more crossmembers, we can slide in extras if needed, so I had four. I would think they fit due to the minor differences from first to second gen, but I've thought that about a lot of things just to find they dont interchange.
