Pete,
We suggest you contact Hov-Aire, and Clifford Development.
Both are located in Three Rivers, Mi. Hov-Aire does rebuilds of Malibu's (beautiful work), and they have partnered with Clifford for the re-engine program for the C550 (FJ-44's).
Websites are as follows.
http://www.hovaire.com/
http://www.clifforddevelopmentgroup.com/