Around here it's the opposite. I found a short bed LEER 100XR. When we (me, seller and friend) taking it from his hanging storage cradle to the truck, one of the hanging cables hit a side glass and broke it. I traded my tonneau cover even for it and the seller and I agreed to $200 from him to cover the broken window. The $$ was on the money, but the glass is sold as a whole assembly. Not bad for $200, BUT it's been on back order for 2 months and no word on when it will be filled. I went to the dealer and they talked directly to LEER and there is an "aftermarket" name that "should" fit and it is 2 weeks out. LEER won't UPS or FEDEX the glass because they usually get broken. They will ship it with the dealers order.
So long story short, don't buy a used one thinking to just get a replacement glass. Oh yeah, the curved rear window, you might as well buy new so they say.