I finally found some tinted plastic that is light enough to see thru and have installed them without screws or hinged vent windows. I used 3M VHB doublesided tape and Sika 295 urethane adhesive at the corners. They seem to be holding things in place very well. The only relief for cabin pressure or fresh air intake is with the helicopter vents. I like the look as it is much cleaner without the screws. It is not "original" but neither is the car.
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