Ok, did a search and got a lot of good info, but nobody really answered the basic questions. I have a 76 Blazer but would like to swap in a 90 Dash and door panels. Is the sheet metal under the dash and on the doors the same for a 90 as a 76? Will a 90 dash slide in and secure the same as the 76 dash? Will the door panels screw on the same way as the 76 panels? Can I leave the 76 instrument cluster intact when I put the 90 dash pad over the top? In all the pictures in the catalogs for the instrument cluster they look the same. In most of the catalogs for doors, it strangely lists 73-76 doors together and then 77-91 together. This is the same for LMC and Classic Industries. You would think it would be a problem if you ordered a door for a 74 and it had a frame on it like a 76 wouldn't you? Shouldn't it be 76-91? I also notice other items like the window regulator and the door panels use the same year designations. On the pictures of the door panels, it does look like the door handle recess sits higher. Anybody with a 76 and prior do this swap? Looks like it would be no problem for a 77 and up, but 76 and earlier is the issue.