NOOOOOOOOOOOOOOOOOOOOOOOo don't take it to a glass shop. I don't know if you ever read the posts about my experience with trying to have a glass shop do mine, but let's just say it wound up involving some damaged trim, some violence, the police, a threatened lawsuit (against me), and me doing them my self. I assume they are done pretty similar to the glass on my car. I found 1 out of 20+ shops I talked to who said he knew how to do it, then they F'd up my trim
It is called Bulk Glass Tape. I couldn't find it at any Mustang supplier, paint & body supply, etc.. I finally found it at a Vintage Ford Truck parts place here in So. Cal. It feels sort of like leather, no adhesive. The trim piece actually compresses it. When it gets old, dry, and thin the trim won't hold.
Here's how I did it. I removed the screws holding the trim piece to the frame. I laid a piece of felt on the glass and a block of wood on top of it. Then I used a small "soft" mallet to tap the trim piece off the glass and the frame off the glass. Next you would place the bulk glass tape over the edges of the glass (I used clothes pins to hold it over nite and then it would retain most of it's shape). Then I tapped the glass into the frame using the soft mallet, then tapped the trim piece onto the glass in the same manner.
If you want to do it yourself and can't find the tape e-mail me and I'll see if I have some left, or I can buy it for you here and ship it to you.
Let me know