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Ron,
Not sure what is meant by "fixed rails." Are they fixed, or attached, using screws/bolts? If so, then look at this old thread: http://www.scubaboard.com/forums/ge...126-freedom-plate-first-dive.html#post5447545. Post #3 in the thread describes what I did. (My wing is different from yours, though.) FWIW.
By the way, my Freedom plate easily remains one of my most favorite pieces of gear ever. And I've been diving since the late 1980's.
Safe Diving,
rx7diver