Hi Sylvio; - I'm in the same boat as you with my 1973
Boler. I obtained the rubber for the front and back windows from Paul Nuemeister at 'A-1 Auto' in Sebringville, ON. He's the
Boler 'guru' for almost 'everything' Boler or
Trillium, in Ontario; and is easily talked to; worked with; etc. YMMV - But, I have decided to pull the windows prior to
painting inside or outside, likely in the spring. My plexiglass is in reasonable condition and I won't be replacing it; but, others have indicated that a replacement piece is usually easily available from your local 'glass' dealer. Sounds like it is fairly easily cut to size.
Good luck with your reno plans.