Does anybody know if the clear reverse lenses fit the blinker lens in the headlight?

Why are you trying to put the reverse lens in the headlight? If you're attempting to remove the orange reflector from the headlight, most people have dremeled that piece out or have upgraded to the 06 projectors instead.

yeah i have dremeled out the amber and replaced with clear plastic already but im not a fan.

IMO, I would not spend money and time on buying rear taillights and removing the clear lens for the reverse light. I would just buy projectors headlights instead. If you still want to use your headlights you have currently and not use the clear plastic you put on, I would suggest buying projectors and mod the housing to fit them in place of the reflectors.

^^ I agree

where can you find that little clear piece for your turn signal headlight for the 2003?

I know it works for 06+ lights but you may be able to fit a 3" projector lens into the cup.