part is 21/32" wide. End piece us 7/8' high and 15/16" wide. Body of piece is 11/16" high, not including roller. All nylon, flat roller. Screw hole is 3/4" from base of end piece.
Bob from SWISCO responded:
November 11, 2020
See if our 18-110B Top Sash Guide matches up. We tend to use a metal roller with this guide, like our 87-058. See if you think this could work for ylou.