One result for your search MERCEDES-BENZ GLK 300 4Matic 2009
3.5 V6 252 235/45 R 20 100W - 255/40 R 20 101W You can mount non-OE marked tyres on your vehicle, but you should change all 4 tyres at the same time
All 4 tires should be changed at the same time on 4x4 vehicles