Most replacements to day for are the longer variant to cater for std and lwb variants. They are still avail from your local MB. Spare parts.
The nasty little clips that hold the sill rubbers on...internal and external maybe a challenge.
MB Spares in Canberra is getting out of the spares game but they may have oem stock.
Finally, the MB Classic Centre in USA will have them.
Work on about 60 bux a piece plus clips plus freight.
I have found it to be a cow of a job.

...work slowly and surely and use plastic tools and plenty of lubricant.