Need help on trim rings

I finally got the disk brake conversion on my 65 cuda. got the wheels from a board member (supposedly off 73 dart ?). Anyway there is 205/70/15 tires mounted on them. No i'm after the trim (beauty) rings and have no idea what size depth wise they are. How can i tell or are they standard size for 14" wheels? The back has same tire size. looks like they come in all ranges from 1-3/4" to 3" deep or do i just measure it? Seems simple but better to ask first before buying them. Thanks

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