I called Super Sprint today to check on this header HDDP recommended:

Try these guys... http://www.supersprintna.com/. They already have a header system for the SLK320 which fits perfectly. Their product # 843301.

Unfortunately this part is for the CLK320 and won't fit our cars. I see in HDDP's sig he has Super Sprint Headers, were they a one off or was the guy I was talking too full of it!

This is who I contacted:

Supersprint North America
3208 Park Center Drive
Tyler, TX 75701
Phone: 800-239-7232
International Number: 903-581-1855
Fax: 903-581-8206
Email: info@supersprintna.com