Just wondered if anyone knows if the 4x4 cossie front discs and calipers are a straight fit onto an s2 rst?

Was also wondering if anyone has fitted the 4-pot 2wd front calipers and discs to an rst as I dont think I have seen this done? (ie would the caliper foul against the wheel)

I was planning to use either of these calipers and then a big disc conversion but again not sure if it can be done.
I wanted 300mm discs and run 7.5x17 polished 7 spoke wheels, any info much appreciated.

Cheers

Paul