besides just bolting them up and aligning them.You'll need to replace the window weatherstripping and more importantly the channel it fits into.Otherwise the windows will not sit flush! Also the weatherstripping on the rear windows is different too 73+ is wider. I changed My 73' doors ( no vent window) to the 72 doors ( w/vents) Your essentially doing the reverse of what I did .Remember also the top of the 73' up doors has plastic cladding where the 72 and earlier has steel .so there will be a mismatch of interior pieces .If you have access to a donor car grab everything that touches the doors windows you'll hafta change it all for the doors/windows to fit right. I have a bunch of stuff left over from the conversion I did. PM me if you need anything.Now if your looking to just put the windows in the older doors sorry not gonna work without a LOT of modification .I compared the doors side by side and it looks way too complicated.
