Unfortunately, I don't really have good answers for either of your questions. I'm fairly certain that the buck tag is the only way you can truly confirm that it's a King though. Another way that might not be as definitive is to see if it still has the brake cooling ducts behind the front spoiler. If they're there, it either means that it's a King OR someone faithfully recreated one.
As for the targa band, I have absolutely no idea - I guess it's worth what you're willing to spend?
As for the targa band, I have absolutely no idea - I guess it's worth what you're willing to spend?