Cantilever brakes for older narrow fork bosses (55mm)? I have an 80s cyclocross frame I am restoring. The fork's cantilever bosses are spaced at 55mm - much narrower than the modern standard (around 70mm I believe).

I tried to fit a pair of Tektro CR-720s, but despite using thinner pads and removing the spacers cannot get the pads to square with the rim.

Can anyone recommend a set of modern cantilevers (preferably wide profile) alternative to Mafacs that they known to work with this narrow spacing?

I'm hopeful the Dia Compe GC-999 might do the trick as they seem to be based on a traditional design.

I also e-mailed Velo-Orange and Paul Components as I thought they had cantilevers that would match, but they claimed theirs don't work at this narrow spacing.
What brake pads did you try? I had a heck of a time getting modern Tektro cantis working on a fork of mine until I used Kool Stop Thinlines with the spacers set for in their thinnest configuration.