In the event that you can't get a glass shop to help you out, contact HL Customer Service with your VIN and explain what you're looking for. Although they probably won't have the glass, they should be able to provide the part number for your window assembly and direct you to the window supplier (Hehr, in my case). They may, in turn, direct you to one of their retailers since they only sell to manufacturers, but you should be able to get the replacement from them.