In midst of rebuilding an rvf one of the fronts has a stripped thread was looking for a replacement before overhauling both new seals etc question is what is the definitive list of other nissin callipers that fit .
Have been offered a freshly refurbed pair of Yamaha blue spots would they fit and if so would I require yam master cylinder ?

Try these, they work great, I've repaired a bunch of stripped threads on various bikes with perfessional results...
http://www.timesert.com/

Dave wish I'd saw this yesterday, I've a set of rvf calipers you could have for peanuts but they need a refurb. Let me know if you want them