here is a place to start.

https//us.hubcentric-rings.com/

i think e-bag and amazon also lists hubcentric rings as well.
i think all are listed in mm, so you may have to convert mm to inch measurement if you don't know what mm your hub od and wheel id are.
depending on the combination, you may have to get the closest ring available and trim the od or id, maybe even both, to get the proper fitment.