Window channel balance top sash guide

A quick learner from Atlanta says:
Window channel balance top sash guide
Can you please help me find one with these dimensions?

5/8? center that fits in window track
1 1/4? length (top to bottom)
1 1/8? across top (cap)
5/16? center hole for screw

Thank you.
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Tom from SWISCO responded:

I'm afraid that we haven't been able to find a top sash guide similar to your specifications. The design reminds me a lot of our 18-178, but our dimensions are different. Carefully look over our measurements and double check yours. Could you potentially get this to work?

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