You might want to check with a tire store that sells a variety of custom wheels. When I purchased the new wheels for my '75 Cadillac tow vehicle, my local Plaza Tire Store had centers the same shape as the one on your wheel in a variety of diameters and depths. Their prices ranged from about $12 to $20 each. I can't remember what the manufacturer's brand may have been - - I know the wheels that I purchased for the Cadillac are Boyd's - - they carried at least four different brands as it took a number of days to get answers from each of the vendors on wheels that were available to fit the early front wheel drive Eldorado.
Good luck with your search!
Kevin
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Kevin D. Allen WBCCI (Lifetime Member)/VAC #7864 AIR #827
1964 Overlander International
1978 Argosy Minuet 6.0 Metre
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