Padey,
yes the standard G4 pads are 54mm radial depth, the pads i was running were AP ferodo DS 3000 compound which i got cheap :-) from a bloke selling left overs from the BTCC and they were only 46mm radial depth. Just thought i would try a known compound against the G4 track pad without spend 500$ for 54mm DS 3000 pads to suit the G4 caliper.
Bit quick with the get what you pay for