Jay, I made a mold of my 2600 hardtop glass. A friend, with some experience with fiberglass molds, helped and we got a good mold, but the experience was frightening. The heat from the curing of the fiberglass caused loud popping noises and I thought my glass had cracked, but all was well. I would not do that again. Larry Bono
Larry, I now understand how you got that particular shape hardtop. You had not mentioned to me before that it hadn't been part and parcel with the car. You now mention how hard you had to work to get it to fit. That makes me more convinced than ever that it was originally a second series two liter top. All the 2600 spiders were supposedly cars with usable rear seats (big joke) and so the hard tops have a much steeper rear window line. Yours is very graceful.
Anyway, I have been frightened about my precious rear window glass, and the outfit in Redmond (near Seattle) that makes the replacement Bayliner boat windshields did not want to take the risk of breaking mine in making a mold either. Regardless, I am sure now that your mold could produce rear plexiglass windows for all version two liter hard tops. Those with the smaller first series could trim a bit. I wish to venture with you in getting at least a dozen made. I have already promised two hardtop owners that I would get some made, and there must be another twenty or so who need them. So, please, find out the cost and get in touch with me. Remember you must already have made a huge investment for that mold. The next ten windows off of it would probably not cost as much as that first one which required the mold to be made.
As for the questions of rubber around the window and the metal trim, my suggestion is that the still available GTV rear window rubber always can be cut to size, and the chrome insert is very flexible and will work beautifully (with the GTV rubber, but not with the original two liter rubber for the window). Incidentally, I believe the rubber for the two liter hard top rear window is still available. Trick is to put the window in the rubber and fit the two liter chrome into the rubber before installing everything as a unit into the top. It's not much different from dong windshields.
So, please, Larry, for the good of all Alfa two liter owners worldwide (unfortunately not for all 2600 spider owners, although perhaps for some) let me venture with you to get a dozen or so made. Your mold has saved me the danger of ruining my top's glass rear window trying to make one. Jay