Slide is different on new arm

A quick learner from Vista ca says:
December 5, 2022
I pulled the arm off and the black slide guide is different, I wonder if I need a whole new arm or can I replace just the little black guide slide
Thumbnail of the uploaded file named 20221203_130721.jpg
Thumbnail of the uploaded file named 20221203_130719.jpg
Truth Hardware Track Slider
Truth Hardware Track Slider
39-529
$1.20
Encore Dual Arm Operator, Sill Mount, Low Profile
Encore Dual Arm Operator, Sill Mount, Low Profile
39-438B
$38.64
Encore Dual Arm Operator, Sill Mount, Low Profile
Encore Dual Arm Operator, Sill Mount, Low Profile
39-439B
$38.64
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