I think they're only available with V-band outlet atm, so a bit of Fab work would be required to fit to an SR.
The reverse rotation means basically the compressor/turbine either spins clockwise or anti-clockwise, for instance if you had a V6/V8 you could top mount a pair of turbo's and they would be a Mirror image of each other, so would aesthetically more pleasing....
Standard twins:
One reversed twin: