Originally Posted by KCM

You don't have to go to the Classic Center. Gaskets are available from many parts sources that sell Mercedes parts. I'm sure this site can get them as well.

After you pull the head, you will want to check for cracks in the head and block. For the block, check for cracks that radiate from the cylinder, especially between cylinders. Cracks in the block are aways bad. For the head, check for cracks radiating out from the hole where the prechamber sticks out, and also between the valve seats. There will likely be cracks radiating from the prechamber, but if these cracks continue to a valve seat or are more than 1" long or so, that is not good.

Before replacing the head gasket, you definitely need to check to make sure the head and block are not warped with a precision straight edge. That is a lot of coolant so either the head gasket really blew or you have other issues, such as a warped head or block, or bad cracks.

Good luck.