Channel Balance Shoe 15-004 or 15-005

A home owner from Florida says:
On the !5-004 and 15-005 is the measurement from the inside of the wing or outside?
User submitted a photo of a window balance.
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Tom from SWISCO responded:
The depth measurement for both shoes are from the outside. Consider it the entirety of the depth. I suspect you have a 15-004 that has just worn down a little with age.
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