Rebuild kits are not available.. Those that do rebuild them are manufacturing the critical seals/gaskets which are NLA from MB.

Get yourself a CIS Flowtech (i've been using them for years) and call it a day..

Used FD's are a risky way to go IMHO.

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta