The model specific tankring is designed to allow easy access to the fuel filler cap without any hindrance.
Please note that the QuickLock tank socket is specific to each model and is sold separately to the tank bag.
For your specific QuickLock tank socket simply count the number of screws on your fuel cap and refer to the tank ring page here.
Please note that the BMW 1200GS and GS1200 Adventure from model year 2008 do not have screws in the fuel filler cap. However, there is an adapter that allows for the use of the Quicklock tank ring system e.g. City or GS Quicklock tankbags.