191-853-717-D - G60 front left Arch - £20.93
191-853-718-D - G60 front right Arch - £20.93
191-853-817-D - G60 rear left Arch - £34.27
191-853-818-D - G60 rear right Arch - £34.27
191-853-717-C - Normal big bumper front left Arch - £20.93
191-853-718-C - Normal big bumper front right Arch - £20.93
191-853-817-C - Normal big bumper rear left Arch - £34.27
191-853-818-C - Normal big bumper rear right Arch - £34.27
8vs & 16vs both got the smaller arches, only the G60 got the larger ones.
The reason for the confusion is that in the US they didn't get the G60, instead they got a 2.0 16v which was fitted with the G60 kit