Felix2.com usually has plates for every State. I just looked, but he does not have any 1930 Michigan plates. You might contact him so he knows what you’re looking for. I found mine on a local sale site, so try Craigslist sites in Michigan.
https://madmaxsauthenticplates.com/s...ategories/1930 This guy has a few 1930’s to choose from.
https://saleofcar.com/plates/1930-michigan-0196817 He has one pair of 1930.