OK, this is a 5 item operation.
1: 3M foam tape.
2: SS roof rail channel
3: Special screws
4: rubber roof rail seal
5: contact cement
I installed mine on a '66 coupe last October. I did a bit of research on the foam tape and found that it is just 3M extra hold, PN 047103, on the shelf at Walmart, was $4.27 a roll. The only problem here is the roll is only 60" long and you need 70", so buy 3. I used a diagonal cut to butt join the ends.
The roof rail channels are very long and not easy to store. You need to find yours. Flat on the top and 2 ribs on the bottom.
You HAVE to use a very flat headed screw. Just get them from Mustangs Unlimited, PR766, $6.95 a set, about page 244. Don't try and use pan heads.
Make sure you have the holes drilled in the car and in the correct locations before the install.
You need a small gap between the SS rail and the 'seam' where the windless goes. I found the front needed 7/8" from seam to screw holes. The top and back needed 3/4". And yes this does effect the sealing of the windows to the rubber.
I put the tape on the SS track first. Make sure you cut the foam out at the screw holes. The foam will just stick to the screw and make a total mess.
I started the install at the back and worked to the front. Pealing the backing off the tape as I went along, about every 12". No rubber seal at this step.
I found that if you insert the seal into the inside lip first, then lay across, then tuck in the outside, it works good. Practice a few times before using the cement. And do not pull on the seal as you go, keep it at ease.
When all was done, I used some black RTV to cover the foam tape edge.
The windows have several adjustments to get the frame snugged up to the rubber. So it does not have to be perfect, just close.
1968, hardtop, 289, C4, seafoam green.
1966, hardtop, 289, original 3 speed, on the road and fun to drive.
1968, hardtop, 200, 3 speed, in work.