there are 2 you can get, for both, you'll need to splice. that would be after cutting off the "connector" which resembles the fan connector on the motherboard.
get
http://www.svc.com/123to3ex.html and splice some wires if you want to connect to the motherboard. red to red, black to black, yellow you dont use.
get
http://www.svc.com/3pinto4pinad.html and splice some wires if you want to connect to the power supply plugs, red to red, black to black (there are only 2 wires)
if you dont know how to splice wires, look it up in google. unfortunately, svc doesnt sell heatshrink tubing narrow enough for splicing applications =(.