I converted almost all my lights to LEDs. In case it's useful to you, I added the part numbers and sources for the ones I got. Keep in mind that I have a TCS so there are probably several differences to your S2, but it ought to get you started. Also, superbrightleds.com has a bulb finder for automotive applications that is very useful.
You should also make sure you get the right color LEDs because they can be so bright that they over power your lens so a with LEd behind a red brake lens would probably give you a pink light.
One thing I would change is I would get flashers of the same format (two lug) for motorcycles. Those are probably louder than the ones I got, but my car is pretty loud so I'm not always reminded that the blinker is on because the "tick" is not loud enough.
Superbrightleds.com
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Brake light (2): 1157-R24-WV
Rear Turn signal (2): 1156-A24-WV
Front Turn signal (2): 1157-A24-WV
Backup lights (2): 4410-W1-CB
Rear Side markers (2): BA9S-R4-90-12VAC
Front Side markers (2): BA9S-A4-90-12VAC
License plate lamps (2): LPC-C-NW2
High beam indicator (1): BA7S-B (for S2)
Turn indicators (2): BA7S-G (for S2)
Oil/ignition indicators (2): BA7S-R (for S2)
Interior Festoon (1): 3610-NW4
Moss Motors
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Instruments (6): 170-972
Summit Racing
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Flashers (2): UPD-90652
