When you say genuine, are you referring to OE xenon ballast and bulbs?? Because if so it is very, very, very difficult to do with the 4x6 headlights we have in our 300sd. (I used to have them, of course, but swithced over to euros), which I put xenon equipment in. First you will need a 4x6 conversion kit, which will allow you to run h4 bulbs. The biggest problem you will face is trying to connect xenon equipment in that housing is the fact that the housing does not allow you to go through to the engine compartment. If you don't understand what I am talking about, because I am not quite sure how to describe this, take out the sealed beam 4x6 and you cannot see into the engine bay looking to the housing. There is little to no room back there to even install the d2s plug, let alone mount the ballast. Sylvannia makes a 4x6 conversion kit which is supposed to be street legal, since it uses xenon reflectors, and not halogen ones. But still, I am not sure how you can get around the lack of space to mount the ballast within that headlight. The easiest thing of course, would be to get some euros. The Bosch units are expensive but with some leg work, you can get a good used set for around 200usd. If you want you can just wait to see how you like the euros and then decide if you want to install hids. The Euros are infinently better in ever way than our tired, ugly US assemblies. If you have any other questions, be sure to let us know. Hope that my information has been helpful.