Dunno really, but the Tokicos are standard fitment on the ZX10R and GSXR (I think), so I'd imagine that spares should be available somewhere. I know the exact calipers are different, but components may be interchangeable?
If it is just the seals you want, then look up your local bearing/seal supplier in the yellow pages, take a sample to them and they will match them up for ya and save you a fortune.