Snakeyes,
The switches are VW Rabbit/Golf/Late Beetle. Part number 112 945 515G. You can probably find one at your local jobber (although I can send you a couple if you can wait).
You should be able to change them without having to bleed the calipers if you're carefull. Have the new switch ready to go as you're removing the old one. Instert it quickly a couple of threads and let it leak a little for a minute. Then tighten all the way. The brake lights will work with only one switch, so you can cheat a bit in the short term by only replacing one. It's nice to have a second switch for backup, eventually.
Have fun in Austin!
