SZMB

As I as replacing the valve cover gaskets on the SLK320 this past weekend, I broke those brittle rubber hoses connected to both valve covers. Any body knows the proper name or part #s for these hoses. I wasn't sure if I was looking at the right parts online. There's only one hose attached to the right valve cover, and there are two hoses connected to the left cover. All three hoses have different lengths. Are these hoses called breather/vacuum/ventilation hoses? The online catalog does not specific which hose(s) are for the left or the right covers. Any body has a diagram of the parts in the engine bay?