I have Euro headlights in both the SEL and SEC. Put LED headlights into both and love it. So...if you need 80/100 H4 bulbs, I can help. The LEDs I liked the best of the two sets purchased were by LASFIT H4 LED Headlight Bulbs, 9003 High/Low All-in-One Conversion Kit, 60w off Amazon. If you are using the 80/100 bulbs already, make sure you have four clean (new) brass fuses for them. If you try to clean a Mercedes headlight reflector, all that I've seen are silver plated and very fragile. They can be cleaned but softly.well took the car on a little run yesterday 230 miles.The temp was just above freezing, car started flawlessly every time & ran great. my heater did not ! but we had heat, just too much at first & through the defrost ( which dyed out my eyeballs ). This has been a problem everytime it is cold, ( i believe it could be related to low Freon in the air con. unit ) but usualy im not driving car at these temps. as the light is short lived at this time of year we had to drive home in the dark & no surprize to anyone these lights suck. i seen some very good aftermarket ones on a SEL & will be trying to source some for the SEC. (any information where i can get some would be appreciated.) filled it up with premium & a can of seafoam, got very good gas mileage which i attribute to driving slow due to over driving the headlights haha.got the car cover sewn up & after a wash she will be stored for another winter, unless the weather allows me to put my timing chain in.