The German cars don't use 194 bulbs, but identical shaped 5 watt bulbs for the marker lights. The bulb number is 2825. I replaced my "Pontiac" tail lights with the 5 watt and it makes a nice difference. I believe the 194 bulbs are 2 watt.
There is also a 3 watt bulb, but I don't know the number off hand. I buy it directly from the Mercedes dealership.
Dave
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1987 GT (my toy-see above), 1987 GT (wife's toy), 1986 SE soon to be VR6, certified master technician/shop owner
www.njautobahn.com