Bought this for my G.SKILL Ripjaws KM780 MX. The ABS spacebar key became too loose after several removals and would fall off if pressed at either end. I purchased a PBT keycap set a while back, but realized that the KM780 inexplicably has a 5.5U spacebar, and was stuck with the default spacebar for some time. This replacement, which I ordered in "White Strong and Flexible," fits flawlessly and has solved all of my problems, though it is slightly taller. I was just about ready to buy a new keyboard out of frustration, but this really saved me! Just wanted to say thanks for making this.