Can you identify this roller assembly?

A home owner from Vacaville, CA says:
July 12, 2015
Hello,

Can you identify the attached sliding-screen-door roller assembly? It has no adjusting screw, and it's all plastic except for the spring.

TIA
User submitted photos of a screen door roller.
A home owner from Vacaville, CA says:
July 12, 2015
Also, I'm not able to identify the manufacturer of this door, but the home was built in 1989, and the glass says "Guardian".
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Tom from SWISCO responded:
July 14, 2015
Good afternoon! We have found a possible match for this roller, but it is not currently in our catalog. I will let you know as soon as it becomes available to purchase.
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Tom from SWISCO responded:
July 31, 2015
Please see our new 84-151. I think this may be what you're looking for.
Screen Door Roller, 1" Nylon Concave
Screen Door Roller, 1" Nylon Concave
84-151
$4.12
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