I’ve got some Dia Compe cantilever brakes for sale on cyclinguk forum. I seem to have just sold the mafac levers though. Let me know if you are interested.
Should take 35 mm.
Cantilever were dia compe.
I have a load of cantilever brakes, from mafac tandem or normal. Dia Compe, and the more low profile type of cantilever. And some magura fluid ones unused. Many years of cycling.