I saw those as well, but for what you are looking for, the other 1 posted should do the trick and it also looks the easiest to install. . . All you have to do it remove the stock power antenna, place that one in the whole and plug it into the antenna extension cord. . . no power, so don't have to worry about the connecting the power source. . .

The S2000 is a screw on. . .

The shark fin also states: Shark Fin Antenna for car decoration purpose - not a genuine antenna (No radio function).
Besides that it will go on top of the car and the integra antenna sits on the back side, so the shark would have to be re-routed to the roof as well as actually be a working antenna, which it is not. . .