5/8" sash guide - can't find on your list

A handy person from Orange County, CA says:
This is from the top edge of the bottom sash of a Milgard, non-tilting window. There are a couple of similar ones on your site, but nothing exact.
It's 5/8" wide, about 9/16" deep, and 7/8" from the top to the screw hole.

Any ideas? I don't want to order the other parts until I find these (so I can save on the shipping).
User submitted a photo of a top sash guide.
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Tom from SWISCO responded:
Thank you for your patience in this matter. We are currently working on a possible replacement for this top sash guide and will let you know as soon as it is online and available to view.
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Donna from SWISCO responded:
Please see new SWISCO product code 18-188, top sash guide, and compare it to your original part.
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