Shower glass door track piece

A home owner from Florida says:
October 13, 2019
The only markings are on the glass itself and says;
Tempered
16 cfr 1201 - II
Ansi z97.1-2004
1/4a sgcc 3960
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Paul from SWISCO responded:
October 18, 2019

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. 
Shower Door Bottom Roller
Shower Door Bottom Roller
10-099
$15.45
Shower Door Top Roller
Shower Door Top Roller
10-098
$15.45
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