Replace the tensioner rail too. It's not much additional effort since everything is apart already. The tip on replacing the plastic oiler tube fittings is also a good one. They only cost about $3 per set. I would also consider replacing your valve cover gaskets unless they are fairly new. Cheap insurance.

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08 W251 R350
97 W210 E320
91 W124 300E
86 W126 560SEL
85 W126 380SE Silver
85 W126 380SE Cranberry
79 W123 250
78 W123 280E
75 W114 280