I have a 1987 W124 and it suffers from light pooy!
I don't have the Euro conversion but do have the 9004 100/80 watt bulbs and wattage is brighter even without the Euro Lenses.
I have instructions and parts required to increase the lights larger ampere load.
Quite a large number of W124 owners have made the mods and are pleased with the results.
If you are interested E-Mail at email@example.com
Happy Trails Beep Beep from high wattage Houston!!!
Donald, El Cheapo