Contact one of the large automobile museums.  I am sure they will have the correct solution for your problem.  I would suggest the Henry Ford Museum in Dearborn, MI, Peterson Auto Museum in LA, CA or the Harrah Collection in Reno, NV.  I have talked with them in the past and they have all been very knowlegible and helpful.
Greg Shuman
National Atomic Museum
Albuquerque, NM

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