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Nice find, I have seen a post here about the lug nuts for those, I believe it was when someone was showing how to clean old slot mags. My brain is kinda fried right now, (very long week at work), someone will bail me out when they see this and will remember.
I found mine for $61 total (after shipping) at EZAccessory online. You might be able to find cheaper, but they came to my door without driving around town finding them I still need the rear center cap however.