RC31s are great forks and pop up now and then in 1". Try a thread in the Wanted section. If it's a large frame you may have a harder search to find a set that hasn't had the steerer cut down, but they are out there.
RC30s have a replaceable steerer tube so if you find a set in 1 1/8 flavour all is not lost. You then just need a steerer tube and the spacer.
justbackdated on here may be able to help with the RC30s or the steerer.
I know this because I have RC31s in 1", and two sets of RC30s in 1" - all fitted to bikes, though, sorry!