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I've been struggling with the same thing with my rs6 pro. Just today I stumbled across this Danish site that has the right kind of crazy EC37/30 EC37/34 headset these frames need:
https://www.cykelgear.dk/reservedele/styrfittings/principia-elipse-styrfittings-1-18in-1-14
PS: Some of the frames also came with a mix of Chris King EC37 Devolution top and standard EC37 bottom. (I salvaged the top and bottom cups of a CK EC37 headset from a cracked frame, but don't have the crown race or top bearing cover):
https://www.lfgss.com/conversations/248225/
Note: EC37 is External Cup for 37 mm headtube, i.e. for 1 1/4" forks.
Sveinung
Photos? How much would you like for it? I have a Principia rex pro Linda McCartney frame but the headset size is mental and cant find a replacement 😡