In the case of the later style US DOT "Euro Look" lights,
there are some Interesting points to consider.
If one were to want to replace a lens on these [ I am talking the 124-94/95,202, 140-92 glass lens] , they will be informed that they have to replace the whole unit. But the surprise is that when they first came out, the lens only could be changed, Then , the DOT got into the act and Benz of NA had to come out with a TSB
[ 382/081- to be specific], that had the Dealers hot glue these lens mounting rings so they could no longer be changed.
Free of charge , of course,,, Well, Thank You MB..
Their excuse for the TSB was the fear that a cracked lens might allow water damage to the inside of the light housing and might impair the light if one were to just change out the lens.
Proper cleaning, of course, would solve this, but the DOT was not hearing it.
My thoughts are it was a quick way to stop Euro Lens 'E Code" spec lenses from being mounted on the US cars...
If one were to dis-assemble one of the DOT early, non sealed units, he would notice that the lens reflectors already have the mounting hole for the Euro 'City Lamps" are already cut into the US reflectors. That indicates to me that the reflectors are the same. And these are H-4 lamps.[9003's].
Sooooo, A couple of Hella Euro lens should give us a EURO E code headlamp.
As far as comparison goes, the US -DOT Euro 'STYLE' do have
a cut -off pattern that is close, but not as pronounced.
The TSB does state that there is objection to this sealing
and has not been ruled on yet.
Your guess is as good as mine....