Hi
Nice that you like it! I have sold several sets of the side windows here in Europe! It is the same factory that's make the front windshields that make this single glass side windows for me! I own the molds but they make the glass. If you like to buy them to US you need to be several or the shipping cost is to high!
They are E approved and made of hardened automotive glass just like ordinary OEM car windows
The glass fits nice in the frame, But you need to modify the door and window lift!
I used a lift motor and mechanism from a modern car that is a lot slimmer than the OEM. Because it has to fit between the glass and inner door trim when the glass is rolled down.
Kim