Our exchange rate sucks, but if you fail to find decent canvas here in Canada, then places like Beechwood canvas, or many of the Jeep supply places will be your best bet.
The plastic windows have come a long way in the past 40 years. There are arctic grades of window material that put all that old yellow stuff to shame. It is a fairly easy job for someone with a industrial sewing machine to replace the window material.
For the upright door rods, I used to modify them by welding a small washer about an inch up from the ends. It would prevent them from pushing the little tabs in the sockets out and falling into the body. Also prevented them from climbing up. A small cotter pin hole at the very top kept them in place.
Personally, I have a complete set of canvas for my Jeep which is now buried in the canvas shed. Jeep days do not require canvas. I have never once put the canvas on in the 10 years that I have owned this Jeep.
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