There is a kit you can purchase off ebay that has all the timing components, new tensioners, chains, guides and all four cam adjusters. I have not decided if I'm going to go with something like that because I'm assuming it is made in China. The cam adjuster from MB is $1000/each
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never had 1 of those apart but as complicated as it is, i would never cheap out on the parts. dealer or the oe brand vendor only.