Identify Guide Ends

A home owner from Longwood Florida says:
I am trying to identify which guide ends I need to purchase for a block and tackle balance which has has the numbers 1620 on it. I have no window marking to go by? Any assistance would be appreciated.
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Paul from SWISCO responded:

Could our 18-110B top sash guide be the match to your original guide? Look over the measurements and see what you think.

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