I ended up ordering all of my glass for my 53 3100, 3 window, from Classic Industries. The 2 pieces of windshield glass were placed on back order. First, I was told it was going to be 2 weeks, 3 weeks max. Well the 2 weeks came and went. I called them to inquire about my back order. They finally called their vendor. The vendor told them it was probably going to be more like 60 to 90 days. So, I ended up purchasing the windshield glass from Classic Parts of America. Used to be know as Chevy Duty. Had a professional install my windshield and back glass. I ended up intalling both my door roll up and vent windows myself. Everything fit perfectly. Very happy with all of it.
Rugo