Window Sash Top Stop?

A home owner from Kirkland, WA says:
Can you identify the part shown in the attached photos? The length is 3.25". There are two installed in each of the Weathervane double sash windows. The windows were installed in 1984. I looked through your catalogue and couldn't find a match.

A customer submitted photo of a window sash stop.
A quick learner from fort collins Colorado says:
there is another piece that I have not been able to find in any site or cataloge. It is a plastic ramp that is screwed in to the top of my sashes (in the 5/8 groove in each side) It seems to slide the channel into position and prohibit it from coming out the top on the sash. I am sending a photo. You have a part that looks like it will do the job (18-065) do you think you have anything closer?
A user submited photo of window channel balance
Profile picture of Paul
Paul from SWISCO responded:
Thank you for your patience in this matter. Unfortunately, after extensive research, we've determined that this part is no longer available. I am sorry that we will not be able to help you any further.
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