Harland sharp roller rockers - measure pushrod length

Heywodja said
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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I used HS rocker arms on the 240 heads on my 470 low deck. Worked fine right out of the box. Engine made more than 700 hp on pump gas. Seemed like a bolt on deal to me.
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