Anybody measure dial feet size of 861/1861 Speedmaster dials?

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I've had a 321 dial that I've been wanting to mod to fit on my 1861, does somebody know the feet dimensions of a 861/1861, specifically the height and diameter? Or have one on hand that they can measure?
 
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馃槈
 
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馃槈
I鈥檝e seen that thread and searched other threads. I know the mechanism, but wanted to know the actual physical dimensions.