No picture for the moment, I'll try to add one later.

I'm installing my new headlights and was curious about a few of the details. On the rear of the Large Euro reflector there are two holes one for the H4 and another much smaller one just underneath. It appears as if another bulb can (or should?) be added to that location. This does not appear in my DOT Bosch set. Also the DOT spec lights have a small tube filled with water that protrudes from the H4 mounting clip, it appears to be a counterbalance? Should this be transfered to my Euros?

That smaller hole is for the 'city' driving light. I don't think your US car will have a switch for that. Some people have jump-wired their parking light switch to activate this bulb.

What year/model of car?

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Chris
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired

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The small bulb socket is for the curb parking light. In Germany when you park on the curb during evening hours, you are required to turn on the light on the street side of the car. The German spec cars have a light switch that allows you to select either the right or left side to turn on the lights.

Every "modern" Benz that I've owned has this switch. That is not an exclusively Euro (or German spec) feature.

The curb parking light is "connected" to the turn indicator/side lights.

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1989 300TE "Alice"
1990 300CE "Sam Spade"
1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007)
1998 E320 "Orson"
2002 C320 Wagon "Molly Fox"

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That's right except that the USA is the only market where the side lights are both turn signal and park lights. Everywhere else, only the lights in the headlights are park lights.

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Kent Christensen
Albuquerque
'07 GL320CDI, '10 CL550. '01 Porsche Boxster
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On my 107, I wired my Euro side markers to act as a turn signal in addition to the fronts. This wasn't easy given that there is only one filament in that bulb. On my spare set, I replaced the single filament with a dual (also not particularly easy), which should turn out better and easier. I think that turn signals visible from the side are a modern-day requirement.

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Thanks all Is Germany the only country which requires this?

What sort of bulb fits the socket?

Ditto here, too. Went looking for a socket that I could retro fit the sidemarker with dual filament bulbs. Didn't see anything I liked, so I just soldered leads right on the bulb and siliconed the bulb into the socket. Just take a little extra effort to change when one goes bad.