Lots of luck! I've managed to acquire a smooth front bumper cover but haven't found the rest yet. FOMOCO will ream ya for new one, if they're still available!
If you can luck out and find an Adrenalin in a junkyard that's your best bet but if Steve M couldn't find any then I'd say just do what Todd Z did to his. Look in the projects section and you'll see it. Good luck.
I used a sander on mine started with 150 grit then worked my way up to I think about 250 and they look pretty smooth now. And I painted mine with the rattle can bumper spray paint. It works well for me since I seem to always seem to hit a rock or tree and scratch them. So I just break the rattle can and they look brand new again.