acouple snes pcb questions

So my buddy bought a snes bundle recently and acouple of sf versions were included. I want to play some sf when I come over and hate playing on pad. I have a hori t6 wireless case laying around ill use with some spare parts. I see several PCB diagrams. Are all the official snes pads good to hack or are there some I should avoid. Also the contacts are black in the diagram will I need to scrape these with an exacto or can I just solder onto them?
Thanks