AirQ......More than likely........your gonna have to touch base with a company like like Sperry, Allied Signal, or one of the Autopilot manufacturers to find out their sources/venders......I am an Aircraft Mechanic with an airline and I do have an FCC as well ..........we pretty much farmed out all that kind of work several years ago after 9/11 or I would call the shop and find out where they obtain replacement parts......Rate gyros are kind of old technology as most of the high tech A/P systems use feedback from accelerometers generally found in the IRS systems or ADIRUs instead of rate gyros........Bill..........