That was not originally Centurion, that is southern comfort conversions who bought Centurion in January of '06. I have tried to buy Centurion parts from them before, but found the parts people unwilling to dig out and learn how to use the microfiche machine they inherited from Centurion.
Your best bet is to watch ebay, or find a different style that is still in production.
Maybe they will be more helpful to you. Would love to see a picture of which style flare you have, but Centurion was having most of them custom made for their trucks only, as with the front lower valance (if you have one)
No replacements are available.