Shower glass door track piece

A home owner from Florida says:
The only markings are on the glass itself and says;
16 cfr 1201 - II
Ansi z97.1-2004
1/4a sgcc 3960
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Paul from SWISCO responded:

At first glance, your part looks like some sort of shower door top roller like our 10-098 and 10-099. Take a look at both pieces and let us know if either one is correct. If not, get back to us with more detailed on how this part functions. 

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