They are a 3157 I think. I bought the silverstar ones from Autozone when I cleared my corners. They are a bluish/chrome color and light up amber. Toucan and a few other companies have full chrome bulbs that light up amber also.
If you have stock, non-cleared factory headlights and add a hyper blue bulb, it will still flash yellow. Since you will still have the orange reflector in there. Since I upgraded to the blacked out headlights with clear reflectors, it still looks nice and lights up amber.