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Velo Orange do French threaded headsets and bottom bracket (not that you'd need them as the ones fitted seem fine) . The trickier thing to source are stems as these are 22mm rather than the standard 22.2mm. Sheldon Brown suggests that it's not a problem to sand the extra 0.2mm off a standard stem.
More information here:
https://www.sheldonbrown.com/velos.htmlThe plus with these era of French frames is they're designed for 700c wheels rather than 27"
Let me know if want any more info or pictures
I have this mystery late 70's French road frameset with vitus 172 tubing and nice chrome ends. Off the top of my head it's 58-59cm CTC with 126 rear spacing. Bars, stem, seatpost, BB (fairly new), headset and defunct crankset (chain rings are sheared from the crank arm - so will need removing and binning) included. I probably have a 700c front wheel I can throw in too. Import FYI: being 70's French it's French threaded. £75 pick up from Hackney
It now longer has the decals and is slightly scruffier from use (until the crank died).