upper sash support

A handy person from 35242 says:
hello,

I need help getting a replacement part. I believe, from my research, that these windows are MW windows circa 2003, double hung wood sashes, vinyl jamb liners. The plastic piece in the channel in this photo is broken on another window and I need a replacement as the sash tends to sag and leave an open gap at the top.
let me know if you can help.

thanks
Marc Wendorf
Profile picture of Bob
Bob from SWISCO responded:

Take a look at the 15-104 Friction Shoe. Compare with your old part to see if this matches up.

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