DOOR GLASS CHANNEL FELTS STRUGGLE!
I installed that kit on my 67,
You have to install it by trimming the plastic/felt and punching holes in just the right places, if you have your oem ones try to duplicate what is there on the new ones.
I did not have any restrictions from the new ones going up and down, I would suspect the alignment of the vent frame and the other door hardware would be more of a problem.
I did find that the plastic / felt was crappy plastic that split if you looked at it wrong.
The cuts you have to make are:
Square - circle - square on each side of the plastic/felt that lines up with the nylon slides. And a small cut out at the top where it goes into the top of the vent window frame when all the way up.
I cut the upper end first to fit the white nylon inserts and once I was happy with the result I tried the length to fit.
Someone on FABO suggested using the loop (felt) side of adhesive backed Velcro instead of the plastic/felt. It has promise.
Either way the nylon inserts are the main fictional part of the kit.