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Happy to help, guys.

For those who might need to do this in the future, the size I found that worked the best was:
Dimensions: 2-1/8"ID X 2-5/16"OD X 3/32"CS (these are general dimensions, the ones below are exact...

Therefore, I started looking around and discovered The O-ring Store https://www.theoringstore.com/store/ where you can buy just about any O-ring that you want. I found that they did sell the size...

In my rebuild of my Dad's old 1961 Willys CJ5, I started to refurbish the older style Warn Locking Hubs that were on it. I'm not sure when these were added, whether they were added by my Dad before...