Will, I don't have Carey's rims, but this may help.
The Chinese chrome wheels that came on my car from VS in 2013 (probably the same wheels you have) were just a tad too big to accept standard aftermarket caps. Standard caps would never really seat right and if you tried driving with them, they'd fly off.
So, Kirk found some Chinese caps that were just a tad bigger and this is what he fitted to new builds then (and maybe still does).
I found this out when I ordered some nipple caps from SoCal Imports. I had to return the caps.
I eventually swapped those wheels for some old Mangels, ordered another set of caps from SoCal, and they fit the Mangels perfectly.
I'm guessing that Carey's wheels will accept the same caps as the Mangels, so you might try ordering some caps from SoCal. Here are their baby moons. Or, maybe try ordering just one first (for just $13.50) to see if they fit.