Try to retain the Mafac/Spidel LS2 brakeset as it is a good quality component from the period early 80's.
It's really the last good brakeset that Mafac made and the fact that it was pulled into the Spidel group speaks well for it's quaility. I'm a fan of the brakeset myself, and I have it on both my French bikes. I have all sorts of other supposedly higher level NOS brakesets, but I still can't find a reason to replace the Spidels with them as they perform so well and look so good!
Chombi