I've just gone through this on my 93. Glass shops will not want to cut your rear window out, there's a fairly good chance of it breaking or the seal being damaged and the glass is worth about as much as your car. Several shops quoted me around 900-1000 for the rear glass. I guess it's not as common to replace the rear as the front. The seal comes attached to the glass already, and I don't believe it is separately replaceable. My rear glass was leaking pretty badly when it rained(my car has no sunroof, don't even mention it!!!). My local Glass Doctor franchise pulled down the back of the headliner, ran a bead of urethane around the inside pinchweld, and then used a needle attachment and pulled back the outside rubber strip and ran urethane inside the exterior channel. I had it done a few weeks ago, and it seems to be holding out water pretty well. I have a single 12 inch sub with a 400 watt amp, and my rear speakers are amplified as well. I think this caused the problem to get worse, because there was no leaks a year ago when I got the car. The rear glass in my 94 leaked the same way too!