2nd gen seat question

I may have a chance to get some front seats from a 2nd gen & rear bench seat. ??? will there work in a 1st gen???

I tryed to put the pass seat out of my 66 Sportvan(parts van) in my 68 and the holes didn't line up at all?? But its easy to drill new holes(but a pain to pach old ones)

When you guys say 2nd Gen..do you mean 71-up Chevy vans or 67-70 vans? I was always cornfused about that.

2nd gen is 67 -70(curved windshield,lower headlights,& square tail & backup lights,oh yea on 68 - 70 they also had side lights) 3rd gen is 71 - 77(I think??) 4th gen 78 -???

Thanks for clearing that up.

My '84 GMC has the same body style of the 71 models.

I list the 78 as 4th gen because they changed the grill, head lights, bumpers ,dash,engine cover(added (kind of)glove box & I think tail lights(or made them bigger) Also they added another body line(mid way from bottom,to stop door dings) for strength. I owened a 72 & 78 Chevy vans 78 was the only "New" van I ever had. And it was the new Gen of Van when I got it??