Harland sharp roller rockers - measure pushrod length

I am installing Harland sharp roller rockers on my set of trickflow 240 heads. I am trying to get a measurement for the pushrods.
I am not sure where the exposed threads for the adjuster are supposed to be counted from since there is a recess. Is it from the area where the threads exit the recessed area of the rocker or when looking across the bottom of the anodized area?

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