Been looking for side glass for my 81. Lots of used junk for sale that are as scratched up as mine. I'm attempting to polish out the scratches but not sure if I'm doing more harm than good. To get the deep gouges out (ones I could catch a nail on) I used 180 grit on a 7" polisher across the entire face to keep it nice and flat and uniform. Working my way up to 2000 grit. Purchased some cerium oxide paste and some felt polishing pads and will see how that works. Just thought I'd start a thread and post my progress. You never know until you try! Will add pictures soon.