They are ususally in the State Archives. But there can be a few locations for Rheinland-Pfalz, it seems they are in Koblenz.

Check here: http://www.archivdatenbank.lha-rlp.de/ and search for "Wiedergutmachung"

Good luck.
--
David Seldner, Karlsruhe, Germany
seldner@...