Is it possible to replace MX Vertical rubber pads?

I have been using the MX Vertical for over 5 years now. For some time, the rubber pads around the mouse has become sticky and worn out. I tried to clean it following the procedures from Logitech website, but it is not really effective. As everything else in the mouse is good, I would like to replace the parts with a new rubber pad, but cannot find any sort of guide for it. Does anyone have a similar issue? What have you done to overcome it?