i only bought a bunch of 3mm LEDs.
the window switches could possibly take the 5mm LEDs.
but i bought the 3mm's just to be safe.
i only bought them online coz they were alot cheaper than buying from stores.
but if you wanna buy from the stores, you should be able to get them from electronic component stores. dunno what type you have in the states, but in the UK, they have them at Maplins. in Aust, you can get them from either Dick smiths electronics, or Jaycar.