Very nice car!
It looks like there are a lot of Euro parts on it. The heater controls, bumpers and headlights are all Euro.
The velour interior was special order in the States but standard in other countries. My 450SEL had velour originally.
All this means that it may have been imported into the US and that there will be some parts that won't show up at first glance in the parts catalogs. You can get parts, but it may take a bit more effort.
Head over to
www.w116.org I think there are some folks near you.
Michael