All 3x57 bulbs will fit, the only difference is the wattage. Based on the bulb replacement guide, 3457 is actually specified.
If you're looking for something different but still legal, I'd recommend the Switchback LED's (scroll down the page). They light up white for the parking light, but the turn signal flashes amber to keep Johnny Law happy. Note that you will need a different flasher to work with LED's. You can either mod your own, or Autolumination sells a modded LED flasher (keep scrolling down from the link above).
