Just my 2c worth !
I think that items like bumper guards, US headlights, whitewalls are all things that can be changed by an owner at any point. You could even have a "US" kit or a "Euro" kit and change back and forth whenever you wanted with just a few hours work !
The side marker deletion requires a bit more than that and I think if anyone has the opertunity to remove them they should take it !
Last weekend we had a large car show here in Ireland and our Mercedes club stand had a former prize winning silver 280SL Euro, and beside it we had an immaculate restored 280SL US version in the identical colour combination, silver with blue interior. The owner of the US car deliberately bought a US car as he preferred the look. When we had the two side by side they really looked like two different models, and I grew to like the little details on the US version, probably because we never see them here so being different it stood out. Having said that I will keep mine EURO !
Also we see a lot of W111/112/108/109's over here equiped with the twin stacked headlights, they look great, but every time I see one with the "goldfish" bowl headlamps it really stands out for me !
Regards,
Ben in Ireland.
'64 230SL 4sp.