370GT/G37 sedan have the brakes which are dual piston with 320mm discs. These are the same as the 370Z Touring, which was not sold in AUS.. Older 350GT sedans could have "sports" brakes which are a bigger 330mm disc, but only a single piston caliper..
I am also under the impression that these brakes are not unique to the V36, but might be used on other Nissans such as the Pathfinder and V6 Altima... Similar with my M35 Stagea which ran same brakes as 350Z touring, which is the same as an XTRAIL...
Akebono's were not standard on any V36 Skyline sedans, but they were on some of the G37 Sports...
Hence the total confusion...
The pads from GSL will fit and if for some reason they didn't cannot see why they would have an issue swapping them...