Well I found out that BestTop must be one hell of a greedy company. A few months back one of the sliding windows on my Fiberglass upper doors busted. Just recently I decided to fix this. I called BestTop and unbelievably they do not sell replacement windows. You have to buy all new upper doors for $900. What a bunch of crap.
To make things worse, when I opened up the window enclosure I found that BestTop had welded the seem closed so that I could not remove the window. Of course I just cut the weld out and removed the window anyway.
So I went to a glass shop and had them copy the other window. So for 100 dollars I have now replaced this window.
So if this happens to you, just remove it yourself and have a good glass shop make one for you out of tempered glass.