That's a good idea. I've found that the guys who are "car guys" have alot more information than some of the guys who drove them and didn't really pay much attention. I can't really say that I blame them; I can't remember what some of my patrol cars had for switch boxes and sirens, but I do remember all of the unit numbers (not that I expect someone restoring a CV to contact me).
The trooper that drove my '83 CSP car gave me some great pics and info, but he couldn't remember what equipment was inside, either.