What are the common replacement bukbs for the from amber ones?

Look in your owners manual or do a search next time. Its all there.
Its bulb # 7440
And most people seem to be putting in the mirrored bulbs that look silver when not lit up and still light up amber.

http://home.cfl.rr.com/icdedppl/faq.html#c1

Get the Pilot Chrome/Amber ones...they are cool because unlit they are Chrome...when lit are Amber....and Legal!

hmm