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How to find centerline off this Fixture

Good morning everyone,
I am trying to figure out the best way to find the centerline from the locator pins to each section of the side walls. We are thinking the fixture is off centered because when you put a part on, it shows a gap between the part and the wall on one side and tight on the other side. I am trying to get some input on the best way to find the centerline. I hope I explained it well enough lol. Attached is an image of the fixture.

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