I have four purchased from J.C. Whitney many years back. They are cut to shape for the front windows of the van and have extra space at the bottoms to accomodate the push-out windows of the rear doors. They are rimmed with the strip magnet stuff, double sewed. They hold well enough that I forgot one was still in place once and drove 100-plus miles with it on the outside of the passenger front door. It stayed there at speeds of 70 miles an hour or so.
Alas, I don't find them in the latest Whitney catalog.
VernM
GMC Conversion van/Wells Cargo MiniWagon trailer
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I have these posted in my DIY van build up but I'll post them here for those that may not venture down that path
Sides are just 'bags' sewn up on my Kenmore sewing machine, using upholstery thread. Screen is the finer mesh black fiberglass screening that comes in a roll from Lowes Hardward (or HomeDepot) Edges have been folded over and stitched. I can roll the windows up/down as needed with out messing with the screen.
The rear uses 2 sections sewn together to make 1 large piece. I stitched Velcro around the perimeter to seal it to the curves of the van doorway. I initially had used a shower bar rod but forgot it on the trip pictured and found a bungee cord worked even better. I don't normally go in that way but if needed I go in/out by pulling the right side up then resealing it. Total time 2hrs to make..