Just thought I'd let everyone on the forum know, since I know some of us also have Fox bodies.  I got an email from Fox Resto a couple days back.  They have been rebuilding Fox coupe quarter windows for years, and everyone I know that has used the service has been blown away with the results. 

For those that don't know what I'm talking about, the Fox Mustangs had quarter windows that were surrounded by a rubber gasket/trim.  Over time from UV exposure the rubber would break down and start to crack and crumble.  The problem was that the rubber is not a gasket; its an integral part of the quarter window assembly.  Replacing the quarter windows therefore became the only way to replace the rubber.

This wasn't a big deal until the Ford and Carlite stock of those windows dried up and the only way to find them was someone selling them NOS.  Over the years I watched them go from $500-$750 a set to $1,500-$2,500 a set for NOS still in the boxes.

Fox Resto saw a demand and started doing the coupe quarter windows years ago, because they were harder to find, and easier to rebuild.  There has been talk for 3-4 years that they were going to start doing the hatchback ones, and finally they got the process to where they are happy with it.  The service is not cheap, though cheaper than NOS windows, and the end result I think is actually better because they are using a higher grade rubber that will not break down like the factory rubber. 

I have a couple sets of NOS windows, but may send Fox Resto the stockers out of my '89 GT before it goes off for paint.  There's always a demand for the NOS ones so I bought them in part because I needed them, but also in part as an investment.  If I were starting the project now I wouldn't even have ever bothered with the NOS ones.  I got mine because I didn't know when (or even if) this service would be available, and the only other option is crappy looking stick on covers for the rubber, or trying to rebuild the damaged areas with auto body products and paint it.

Anyway, here's a link to the site and the service:

https://www.foxresto.com/1987-93-Hatchback-Quarter-Window-Reman-Service-p/21087022.htm