Jean, your engine cover is from an SLK. The auction cover looks like a C320 cover. The SLK cover is one piece, the C cover is 2 piece. It appears to be the 2 piece cover, but hard to tell with just one pic. The C cover has larger opening for the inlet tubes.

Compare your cover to the auction cover. Look in the front corners, they are different. The area around the oil cap is different, and the area on the right side front is really different when looking close. Look at the very rear of the filter area. Yours is slanted, the c320 is straight or parellel to the firewall.

Either one will fit on the engine. The c320 uses much larger filters also.

Here is an SLK:


Here is a c320 or the one in the auction: