Finally got pics together on the SLK 230 Kompressor unit for sale, can send on request to those who were interested, and sorry for the delay - had trouble getting to the unit in storage and getting my digital camera back. The part number is A 111 090 03 80, which is the number for the supercharger with the switchable clutch. Part is excellent, has 14k miles. Asking $699 and have some offers but no cash has yet changed hands. Email for further discussion at martinstimson@yahoo.com, thanks, Marty