Need Help with this rail guide

A quick learner says:
Good Morning, The top part of this plastic part used to guide the shower door, but is now broken off and the shower door flops around. Can you please assist in finding the right replacement part.
User submitted a photo of shower door hardware.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
I'm afraid I'm not able to get a good look at your guide from this photo. Look at our 10-218 guide to start out and see if that is the part you are looking for.
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