Jasmine from SWISCO responded:
October 2, 2023
Thanks for posting! The piece you are looking for is called a track slider; you'll need part 39-529. This is typically compatible with the 39-528 Casement Track and the 39-253RB and 39-253LB Encore Dual Arm Operators. Take a look over the dimensions below to confirm that this is the right fit. Alternate image for 39-529
Alternate view with measurements
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