They never made a set for the VFR. They just used an F4 front wheel and a wider 6.0" Ducati rear wheel coupled with an adapter to offset it to clear the VFR's rear caliper and still be centred on the swingarm.
I have used both the RC51 SP-1 lower and the CBR929/954 lower on my bike with RC51 and CBR929/954 forks. There is no difference in fitment that I could ever see. The CBR lower looks a lot easier to tap for steering stops if you want ~ I just ground mine off and left it like that.
There was someone on the board here in the U.S. that had a VFR400 (NC30) with inverted forks ~ I think they were from an RC51, actually. Try making a thread with NC30 and/or Inverted Forks in the title and see if they show up to give you a hand.