Well, this is a pickle. It is super annoying, when you are hunting for some seemingly simple part, that can derail your progress.
The bearing I used on my 70 Duster is the 2" OD, 1"ID. I'm guessing it's the ER 16 that you made reference to, which won't work for you.
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Have you tried GOOGLE for a 2.25" OD, 1" ID, snap ring bearing?
Is there a Fastenal near you?