I have been on a hunt for air spaced tuning capacitors, but can not find them. I was even reffered to a guy in the UK that supposedly stocked everything & he only offered I got to rallies in the UK. I dont think I can justify a trip to the UK for a few tuning capacitors to my wife
They look very ordinary and they are not air spaced caps.
The red on can be of muRata series, cpacitance value 4.2pF - 20pF,
the other on looks like 5.5pF - 65pF of BC Components.
Both can be ordered from RS Components or Farnell-INone ..