http://uk.youtube.com/watch?v=MNstobEAado
If you don't use the LED's in the video then just sand them down and then it doesn't matter what you buy, just any IR LED will do and use this to deteremine your wiring and resistor size.
http://www.free-track.net/english/hardware/calcled/?PHPSESSID=ffbb0aa04b8324878079e61c32f176a4
Once you determine the LED's you have and the voltage you wish to use if still unsure let us know and we'll get you sorted out.
Curtis