I quite frankly wonder how such a handy thing did not come for sale any earlier. Having my wah on the board has always been a pain, mostly due to the fact that its rubber feet won't allow it to solidly get stuck on velcro. This means any time I'd pick up my board and hold it vertically, the wah, which is fairly heavy, would disconnect and fall off, dragging whatever cabling and other pedals would manage to bring down with it. Annoying as hell to say the least.
These 2 little pads simply solve the problem, the only advice I have however, is to make sure you have longer spare screws for the base of the wah. The wooden/velcro feet require slightly longer screws.
For the rest, top score for this simple yet unbelievably useful product.