I need a door jamb measurement

Ok, I measured the diagonal. I came up with 60 5/8" running both directions. I measured from the top corner as before, and down to the pinch weld above the rocker on the opposite side. There's a notch in the inner sheet metal right in the middle of the curve from the rocker to the pinch weld, shown with the arrow. I put the tap measure on the outside of the pinch weld there and measured across to the top corner.

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