Clearing the lights
It looks like you can clear your lights the same way I did... just remember to be careful when prying apart the acrylic from the plastic frame. I set mine in the sun for 30-45 minutes, and living in AZ that heated them right up!
When I chose the amber bulbs, I just went to Auto Zone and did a cross-reference for the "stock" clear light bulbs, then physically looked for the same model with the amber color. It was pretty easy...I found 2 different part numbers for the amber bulb that worked, so i chose the cheaper of the 2... Should be about $5-7 for the pair. And since I bought them from a local store, if they did not work for any reason, I could return them.
Take the time, do it right, and you'll be very happy with the outcome...