Tricky little bugger. It's not very intuitive and difficult to see, but I got it to open. You push the top of the clamp toward the center of the car and both sides of the top of the clamp unhook. This allows access to the bulb. $7.00 at the dealer's parts dept. Thanks Mike for the inspiration.

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Michael

1988 300 SL (5 Speed)
1994 E320 Wagon
1997 C230