Alenco window part

A home owner from People's Republic of Austin,TX says:
I have an Alenco aluminum window and have replaced the spring mechanisms with new ones from Swisco. Now I need the upper black plastic part shown in the attached photo. It is 1" X1" in size. Please let me know if you carry this part. Thank you.
sash guide
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Paul from SWISCO responded:
Start by looking at our 18-174 and see if this is a good match. I would just make sure all our dimensions match up.
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