2 door and 4 door window mechanics and weatherstripping are completely different – mainly because the 4 doors have a frame around the windows.
Weatherstripping will be the tough part. If you can find a NOS part, then it will be for one corner of the car only (if you can find that).
The rubber/felt part that goes around the top 3/4ths of glass can be purchased aftermarket.
The various window parts inside of the door can be found a lot easier than anything else can.
The rubber/felt part that goes around the top 3/4ths of glass, to test it - take a fingernail and poke it. If it is hard then time to replace.
That part on my 5th is as hard as a rock and broken.
The same part on my Volare is soft and pliable (same exact part and part number) and hasn’t been effected by sun and time spent outdoors all of its life.
Pictures of part on my 5th Ave. I suspect your rubber/felt part is rock hard as well (but I’m not sure). The RED arrow is the part that goes around the glass and in this case, is showing where mine is broken at. You can see the profile of the part in second picture.
The BLUE arrow is showing the weatherstripping that goes around the perimeter of the door
These pictures were taken at my place of work.
The 30-40 year old grease gets hard. Removing old grease and applying new grease to the window regulator and guides can help a lot.
The motor part of the windows can and do fail, but the plastic gears inside of them break a lot more often. The gears are reasonably cheap and easy to fix. The motors fit darn near anything in that time frame and are fairly common as well.
Picture swiped from eBay.
The item in the red circle, there is a thread about replacing those with nuts with corners rounded off – which I plan on doing on my next window motor repair.
A couple of years ago, I replaced the window motor gear on R/F window. Now my L/F gear needs replaced. It will go up, but the final ½” needs help to finish movement, or it just pops.
Gotta be careful taking the window motor off because of the spring on the window regulators. Those springs are to offset the weight of the glass, but they do have a lot of power behind them.
There is a right way and a wrong way to remove the motors from regulators.