One of the first things I bought for my G310R was a Pyramid Plastics Fenda extender for the front. So if anyone is thinking of buying one take a look at the pic.
I am not complaining about Pyramid Plastics but the extender doesn't work very well because the G310R front mudguard is too short for the extender to be more effective. The Front mudguard on the GS is longer and if it could be fitted to the R then attaching the fender extender to it would probably work, that's if it fitted!
Compare the R and the GS-
So if you're thinking of buying one just be aware of its limitations, at least it saves the top of the radiator area.