w123fanman, recommend buying all gaskets and O-rings from a MB dealer ... either locally or online at wholesale prices. Where you need a sealant use the MB black sealant that comes in a caulking gun-like applicator ... it's fairly expensive, but very effective. Especially for the upper timing chain cover dabs at the end of the U-shaped gasket which is a job you don't want to repeat anytime soon.

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Fred Hoelzle