Hey - I have an 05 roadster, garaged with the same mileage as you and my window peeled off the top last week; I've also been told that only the OEM has equipment to install the window and a whole new top will be required. If I don't find a better solution, I'm tempted to have a marine top manufacturer sew in a zipper with eisenglas in it; it's not like I use the defroster in the rear window much down here.
Kristin