you can swap an 03-04 cobra radiator with very few mods. and they can be had for $200 or so from randy stinchcomb new. only real difference is its all aluminum verses having plastic tanks like the previous ones did. i did it in mine aand havent had any problems.
if you do a search for it youll find a few old threads about it by me that goes over the small things you have to do to make it fit.