I can almost guarantee the ones he is selling on CL are replicas. They didn't come black with a red lip stock. I'm 95% sure of that. The site I linked you doesn't show the vette center caps, but they do come with them when you order (they don't offer a blank cap) I know this because that's the same company that my wheels are from. The guy on CL probably bought them from eBay but the seller is most likely the owner of the site I linked to you.
As far as tires, I recently bought 4 new tires from Discount, and they were 275/40/17 and it ran me ~$700.
18" is going to run more. So, if you buy those rims, and want decent tires, you're looking at dropping an easy grand, if not, closer to $2k.
And no, I hardly ever sleep. Got too much hw to do, but am on here instead of doing it. :lol: