Not affiliated, but thought this was really a neat idea...

New Rear Window Sun Shade for Mercedes Benz W123 | eBay

nga Thats funny .I had a set of those going back to 1966 .Only mine were blue . They are fully adjustable . And did a good job..Only thing driving with the window down, the wind , would make them noisy .

I like them If I ever get into another sedan I may have to get a set.