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How to measure this in the best way?

Hello,

I am stuck with a conundrum for a part we're measuring - what would you guys think the best way to measure the 154,9 ± 2 mm dimension is?

The profile of any line is measured by best-fit with the coordinates reference points, but the view in the red square has a different alignment, with an origin in the bracket.
I would like to best-fit align this view as well but lock the 76,3 dimension only, is this possible?

Thanks for any input!

- Sinom