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I have seen these on 924/944 in person. They were pretty popular when these cars were new. Most were made of thin aluminum and got damaged easily.
From a functional stand point they were pretty useful, kept direct sunlight out, but let you see (mostly) our the rearview mirror.
Ugly as hell.
OK... I'll admit it, I had them on a Camaro (they came with it). They are totally functional, kept the interior much cooler in the hot NM sun. They also flop around at high speed, and leave marks in the glass.