yeah in order to get the calipers to fit over the discs, what i meant was either size of BBS RA will clear the 256mm calipers without any issues.
After some research, the 2 sizes are:
191 601 025 AE - 6.5x15 ET33
165 601 025 - 6x15 ET35
not sure which ones clear the G60s, but I'd hazard a guess it would be the 6.5J ones as they're a lower offset.