Question about stem sizing (controltech)

Rally_cat

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I've searched all over but can't find an answer. The outside diameter of the stem I am using has a one inch quill diameter. From what I can find the measurement of a fork is taken from the outside diameter correct? In this case (a 1991 project two) it appears to measure 1 1/8". I found a controltech stem that states 1 1/8" on the box. Are they referring to the diameter of the stem (quill) or the outside diameter of the fork? :idea:
 
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