Keep in mind that the seller actually buys wheels and things from local 5.0 and import guys through local ads -- giving the story that he'll his club members can use them, and then he sells them on eBay.
He's an opportunist, so keep that in mind.
And while some of what he sells are Saleen items, these don't look like the real deal to me.
He's got a '93 Mustang 5.0, so his reference to fitting them on an '03 5-Lug Mustang would be a typo.