Complete Brittain B5 system.  These are considered approach approved.  STC is most likely available from Brittain.  They have been quite generous with this in the recent past. Includes items in the picture plus the altitude hold chamber.  I am told it was all working when removed for upgrade (came from a customers aircraft, but not removed by me).  Servos are leak free.  Gyro spins up on bench.   Altitude hold works on bench.  Note that it does not include the altitude hold servos.  I purchased