don't expect perfection though, they are a bit wavy, but fixable. i mounted them, then blocked em, then primed and re-blocked, still a bit wavy, but good enuff. should use flexible primer for it too... which blocks for shit...
or just take your's off and smooth them your self just be careful not to burn through them, then just use body filler and smooth back out and prep and paint
that'd be tough to get the factory ones (if they are similar to ext cab version) to fit like the street scene ones do, you'd have to add a lot of material along the bottoms to get them to meet up to that body line flush. not even sure it'd be possible to do it in a way that'd last without cracking.
if money isn't much of an object, I know that grant kustoms will make metal ones for you, but i can't remember what they quoted me for it...