'interior interchangeability

1st generation bucket seat tracks are quite different form 2nd gen', wont work. We can't see what tracks are under those buckets but the hard backs do have the carpeted toe kick area so 66 is probably correct. Pretty much the same seat frame, except the upper member of the bucket back frame is tubular. In 67 up that member was formed to square and has provisions for head rests. The earlier tubular member makes the back frame a good 1/2 inch taller than the 67 up. Later covers do fit but not exactly right. Binding hem at upper corners peeks out from under the hard back. I'm pretty sure 1st gen' rear bench would be different from 2nd gen too, narrower, back a little bit shorter.