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.
130 mm back end.
The spigots were put in for cantilever brakes, if need Vee brakes possibly reduce spacer depth. I can measure later , but that might give you an idea.