Just to get the differences between head light units sorted out:
This picture is taken from my 1993 W124 300CE convertible and shows the fixations of the (older) euro lens on the euro head light units.
In europe the lenses are fixed on the head lightunits with the clamps shown in the picture, all around. The reflectors inside the head light units, the vacuum height chambers and connectors at the back are
all equal. There is no difference between the units before and after the hood change in 1994. The only(
!) difference is the curve in the upper corner of the lens.
I have changed these lenses in the past (updated "89 300D) and will change them on this 300CE as well (within a month).
If the US version of the euro lights have the same clamps for fastening the lenses, than they are interchangeable...
Let me know whether the US euro lights are the same!
greetingz,