in post #5 is mentioned that most likely is the interlock cable, but is no longer available in crossfire warehouses.
have been trying to find it with european parts but no luck.
but if our car is based on the slk320, and there were over 33,000 made, why is not available?
The following are production figures for the R170 SLK:
SLK 320: 33,416

Total 311,222