Actually, the PS2 uses a proprietary connector for one end of the component cable, and the other end is 5 RCA style jacks (red, green, blue/ audio L, r).
Honestly, I just get the Sony cables, because any less is cheap (and typically quality gets kinda sucky) and any more is futile (Sony cables are pretty much a guarantee to work with the PS2, and anything else more expensive is just for looks and will not generally improve audio/picture quality).