I'd say it's about 90% common parts and 10% USA-specific.
No carb M110s in USA, of course.
As you may know, MBUSA provides free access to its entire USA model parts system at
http://epc.startekinfo.com
For $12/year you can expand this subscription to include all models worldwide. I've done that and I can see your 123030.
Of course, this isn't an "ordering" just a "lookup" site, but I suspect you're going to have to do the work here and starting with the part number is the first step.
I order "Euro" parts from
http://www.speed-autoteile.com