When I had the body work done on my US 1970 280SL, we welded in metal to remove the openings for the side markers. When I get to bumpers, they will not have the bumper guards or whatever they are called.
I'm not going to try to get every small piece to be euro but, for me, the side markers had to go.
To each his own. If you like the look of the side markers, keep them, if not, its your car and do what you like!
But that's just me.
Lee