Where to find Diamond plate tailgate cap for my 2006?

Hey guys I've been looking for a diamond plate cap to put along my tailgate but I can't find one that fits ANYWHERE on the internet. The only one I found is a OEM spoiler COVER. and since I don't have the spoiler it won't fit. Does anybody here have one on their truck or know where I can get one? I guess if it really comes down to it I can buy the factory spoiler first or get one at a junkyard but I wanna go as simple as possible and find a straight up Diamondplate tailgate cap. And its gotta be diamond plate since thats the whole theme I got goin on with it right now!

Thanks!