The Rear fog light I believe was available on US versions. My car has it, and is a US version not a euro version.

Its basically a really really bright rear brake light when on, its basically brighter than the brake lights themselves.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U