Plastic stop on top of window

A handy person says:
Need this piece for both sides of top of double hung window. Brand of window unknown. I bought new channel balances for third window earlier this year.
Any help will be greatly appreciated.
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Paul from SWISCO responded:
I'm afraid your image did not come through. Could you try uploading it again? Hopefully we can help!
A quick learner says:
I am re-sending the photo. I hope it comes through this time.
User submitted a photo of window hardware.
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Paul from SWISCO responded:
Thank you! It's tough to say without seeing it out, but the style of the top portion of this top sash guide reminds me of our 18-124P. You may still want to remove it to be sure everything matches up, but there's a good chance this is what you have.
A quick learner says:
Thank you for your help. I will try these!
How to Replace a Top Sash Guide [1080p]
How to Replace a Top Sash Guide [1080p]
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