I dont know where to find one, but getting it in shouldn't be too hard. Just be sure to buy a new rubber seal to go around the glass if the old one has any cracks or large cuts..

the best way ive found to install glass thats not glued in, is to put the rubber on the glass then wrap a piece of small insulated wire around the entire window, inside the rubber, make sure the ends of the wire are over lapped a ways 6-10" and accessible . Spray some windex around the wire. Then get a buddy to help place the glass where it needs to go, then get in the car and find the ends of the wire, get your helper to press on the glass, from the outside, to get the rubber to start pulling inwards on the lip where the rubber should be.. once you get the rubber overlapped, slowly pull the wire, make sure you dont pull it out (Hold the other end) by pulling the wire you should see that the rubber can be pulled to the inside of the window frame. basically thats all it takes, just work your way around, some spots you may need to use a screw driver to pull the seal, but usually it just pops in..

Then pop the trim pieces back in (if equipped) wipe the window down with some windex and go for a test drive.