I have LED 7" Units and the car has passed 2 MOTs without comment.
The light output is modern, not vintage, as I found out on Wednesday last.
As far as I know LED lights require neither self levelling not headlamp washers....certainly neither Mercedes has self levelling nor headlamp washer.

The 7" Units are very similar to the ones used by MMC in the CX chassis cars, they have a "side light" strip across the front, not a DLR one.
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Peter,
66, 2016 Porsche Boxster S
No longer driving Tarka, the 2014 Plus 8...