Rim width is measured from inside the bead lip to inside, not the outside of the rim to outside, so 9" and 10" is correct.
If anyone has been telling you different, they've been telling you porkie pies - Tyre and Rim Assoc standards doco has all details
In your 11" photo, you can see that rim bead lip is ~0.5" - so rears will be 10".
RB
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