I cracked mine when the dash bumped a tree. I took it off and super glued it. It pops on in a werid way I thought and it took a couple of tries to get it on tight. I'm not sure they sell them separately or not. I bet they could be made on a 3D printer super easy and in many colors. It's pretty light plastic.
My buddy with a brand new 9R saw that his was coming off before he even put it on the snow. He glued it on to secure it. I have a 22 Kaos and mine is tight.