EURO Mercedes Headlights WIRING ADAPTERS + BULBS H4 H3 194 FOR W123 W124 W201 W126 (8 pieces included) pair of Mercedes Benz 4-to-5 pin EURO Headlight Wiring Adapters + a pair of Clear Halogen H4 bulbs + a pair of Clear Halogen H3 bulbs + a pair of Clear Halogen 194 bulbs 4-to-5 Pin Adapters to help you install the EURO headlight to the US spec models! his is the solution you are looking for when you upgrade your stock US/Canadian spec headlight (which has 4 pin connector)to the Euro Spec Glass Headlights (which has 5 pin connector). Usually without this, the installer has to cut, splice some wires and need to do re-wiring, plus testing + and - in order to find out each pins' functionality. That takes some skill, time and labor. BUT Now, with this, simple plug and play, no cutting/splicing, have your Euro Headlight up and running in 60 seconds! Yellow = Low Beam's Positive, White = High Beam's Positive, Red = Fog Light & City Light's Positive and Brown = Negative Ground - plug them the way as shown in the above configuration photo. Please note that we do recommend that once you have plugged all the wires, use some silicon around the pin connector to seal it around each pins, so it avoids any future possibilities of water getting near it. This item is NOT for US spec headlight use, it's for Euro Spec use only!