I recently have been getting into repairing controllers, and I have been searching all day for the things that go between the Circuit Board and the buttons. I found what I was looking for: Silicone Button Caps!

Post your components you are looking for here. Maybe someone else may find what you are looking for. Now we can at least reduce the necessity of cannibalizing original controllers, as well as after markets!

Now if you excuse me, I need to start ordering these and cackling maniacally.