Hello Roger,
There are quite a number of Datacard gurus around here, especially Klaus Drexel and Doug Kim. Myself is a datacard hobbyist too.
OK, you can find the softtop color in the field "wenig gewünscht" (= less demanded). It's a three digit number like 720 (black softtop) or related. See
http://www.sl113.org/data/show_table.asp?table_name=usr_soft_top_codes for the details.
The carpet color is not individually specified on the datacard but goes parallel together with the interior color. If I remember that correctly, there were about 15 - 20 MB Tex interior codes and about 23 in leather or so. For these different interior codes there were a few less carpet colors, let's say 15 or so.
There is a special interior code book in the hands of the MB dealers that can then tell you which carpet goes with your interior.
For instance: for dark blue leather (color 5300, code 220) it was a dark blue square weave carpet until VIN 012466 but a dark grey from VIN 012467 on ... and so on.
So, we first need your interior code up in the first row. I think the field carries the designation "Ausstattung".
It "may" be that you do not have a color code for the softtop. This is for cars with option code 41/5 (I believe), which were cars delivered with hardtop only.
Maybe a previous owner then added the softtop later.
Best,
Achim
(Magdeburg, Germany)