I bought some window plastic at Camper's Village in Ed. It cost about 6-7 bucks a metre at the time. Good stuff, very durable. It also was tinted. They also carry just about any fastener you could imagine, zippers included. There is a person who sews and repairs tents and canvas stuff in the shop. The costs were pretty cheap. I sewed my new window in myself with a plain old household sewing machine, no problems. If you're in town drop by and check them out. Hoddie.
http://image1ex.villagephotos.com/1946735.jpg
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'82 CJ-7, 258, TFI, MSD coil, MC2100, T150, D20, stock axles and 31MTs.