Aluminium sliding windows horizontal

A quick learner says:
Hi these small plastic serated pins are on my sling window two at the top that keep it guided when opening most have simply gone
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Paul from SWISCO responded:

We offer two parts that may work: our 67-007 and 87-132. Take a look and see if either one could work for you.

67-007 : Button Bumper
Button Bumper
87-132 : Sliding Window Glide Button
Sliding Window Glide Button
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