It's super easy, just pop the plastic cover off, and it's right there. When you see it you're gonna think $30?????!!!!!! . . . for this???

Unless it's made of some hi-tech material that is actually more than what it looks/feels like, the price is pretty outrageous. I assume it's because there is probably so little demand for it that it actually costs quite a bit (per piece) to manufacture/distribute. That would explain why aftermarket companies may not be offering any.