Ahh.. Did you try putting in a NOS switch? Happens to the best of us. Anyways, any OEM Scion parts website will have illustrations of that part and you can see what it is called and go from there. Also, what I always suggest is just going into your Toyota dealership and have them tell you the part, because again, they have drawings of the specific things you need and you can point it out and get the part number right there. I don't know why people don't utilize the dealer more often for things like that. And plus this way you know you are getting the right part opposed to hoping its the right one online because the drawing is for a 1999 Chevy Cavalier but it looks close enough... Go to the dealer.
...and remember kids, wheel gap is bad for your health.