Have to disagree with Socket, whilst the "first" one (Wunderlich) appears to give more protection, you lose a lot of material off the top when fitted under the original mudguard and the lower part ( despite looking nicer and matching the original guards contours] , is not such a good fit in my opinion,also much narrower, therefore offers less protection). on my 2009 GSA. Got both at the moment and choice for practical reasons, to keep engine / exhaust cross pipe cleaner was the "second" one which I believe is aPyramid Fender Extender product.
Just this evening I offered the Wunderlich one to a friend to see if its of use for one of his KTMs. If it doesnt fit you are welcome to it so long as you dont need it until next week as I wont see him until Sunday. PM me Monday and if its not getting used you can have it. Remember you will look good and muddier and thats sometimes the way to go on a GS!