The zenith rebuild manual is still available from mercedes. See the classic center's portion of the web site. It should be up on the web too.
The photo quality is poor, but the instructions are fine. If this is your first time, I'd purchase a few spare assembly gaskets for the upper and mid-level of the body. They're a few $ each. I presume fastlane can supply them. The first time I did a zenith setup I went through three sets of those gaskets.
-CTH
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