I have the rear window shades. I really like them myself. They clip on and cover the entire window and allow you to roll the window up or down and still have the shade in place. We have a young daughter so we had to get something to keep her from cooking. I have had no quality problems whatsoever with it.
What year is your car? Can you post some pics on how the shades are attached to the window frame, plz?
I just called my dealship - for 2002 C320 part# 6669 1301/1302(L/R) $74 each
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Custom painted front lense covers and grill; Tein Lowering springs; Custom Flowmaster dual exhaust; K&N filters; de-badged; Euro style rear window spoiler; AMG trunk lip