When I get a bit of time, I'll try to put together an annotated diagram for the AIR 1/Pilot. In the meantime, I'll send Bryan a copy of the latest cross reference spreadsheet.
I've looked up the part numbers, but I no longer have any AIR 1 or Pilots to verify the info, so if any of you sharpies have corrections to make, please do so and I'll update the list.
For the AIR 1 you'll need the following o-rings in addition to the seals for the hose.
Refer to the AIR diagram.
SP Item number)------------------O-ring size
20) -013 (2 each)
22) 5-125 (non standard size) which is a 4.57mm i.d. X 1.02mm c.s. for the poppet
or if you have the modular poppet
2.2mm i.d. X 1.0 c.s. (same as an s-wing balance poppet found on the G250 et al)
A sincere THANK YOU to all at VDH who make this wonderful resource available and to all the thoughtful contributors.