sash cam-need help finding replacements

A quick learner from Montgomery, TX says:
5/8 " channel, 1 1/8 " length
Thumbnail of the uploaded file named 12143585-00E2-4B45-9EC9-7469487C2341_1_105_c.jpeg
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Tom from SWISCO responded:

Hello! Thanks for contacting us. Your top sash guide appears to be a match for our 18-174. I think this may be what you need, but you can review our dimensions below to verify.

Unfortunately, this part is currently only made in black; the white finished is discontinued. I apologize for any inconvenience that may cause.

Detail of 18-174
Detail of 18-174

Side view of 18-174
Side view of 18-174

A quick learner from Montgomery, TX says:
Thank you! Is there an alternative for this part that comes in white, or do you have a suggestion for what we can use for a replacement?
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Tom from SWISCO responded:

There is no alternative that I know of, unfortunately. This top sash guide has a fairly unique design and at this stage it is the only part we carry that would work for your window.

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