I have a fibergl*** 29 model roadster with a 31 style windshield,it doesn't have these. What are they for and are they needed?
By 31-style windshield do you mean that you have folding windshield posts? I think we'll need some photos to see what you're talking about.
You mean the rubber gasket? More than likely you would need to test the fit for a rubber gasket before paint and chrome. If you already have stuff painted and chromed, it might be too late. Fibergl*** bodies are known to need adjustment before paint.