FH2 weight ring size?

Tried some googling off some measurements and not sure Im finding the right size. Does anyone happen to know the size of the FH2 rubber oring weight?

I can take some measurements when I’m home tonight, I used to know off the top of my head but it’s been a while.

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I’ve always used: 1 and 3/8 id, 1 and 7/8 od, 1/4 in. thick.
Don’t know what the official size designation is.