Plastic part installed top side of the window which holds the spring

A home owner from Alston, MA says:
this part is 2 1/4 x 3/4 x 7/8
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Emily from SWISCO responded:

Hi there!

We don't have this exact top sash guide but start by taking a look at our 18-188 and compare our dimensions with yours to see if this matches what you need. 

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