Can anyone tell me what manufacturer produced the original equipment dampers for the SRT6 Roadster? Are they gas pressure? Are they multitube or monotube?

The reason I ask is that I will soon be acquiring a 2005 Roadster. I know that Mercedes Benz has had a long working relationship with Bilstein and wondered whether this may have carried over to the SRT6. If they are not Bilstein I will plan to change them to Bilstein soon after acquisition - for the improved ride/handling compromise that Bilstein offers.

Thank you in advance for any information that any of you may provide.