Kennatrack scottie replacement roller

A quick learner from Hawaii says:
Looking for a replacement roller for a closet sliding door.
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Manuela from SWISCO responded:

Have a look at our 23-001 and 23-002 offset roller. Get back to us and let us know if either one of these will work. Keep in mind that the bracket holes will be different, but it shouldn't matter as long as the wheel and backset are the same.

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Paul from SWISCO responded:

Hey there, I thought maybe I could add my input as well. Looking over your photos, I think our 23-048 and 23-051 look a little closer. They're definitely worth considering, at least. Definitely look over both pairs and get back to us if you have any questions!

A quick learner from Hawaii says:
The 1/4" offset is right but the broken roller is about 1" diameter. It has a flat edge; it is not rounded.
Will a 3/4" roller work in the old track?
Do we need to change all 4 rollers including the 3 that are not broken?
What does the "B" printed on it mean?
Thank you.
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Paul from SWISCO responded:

You are correct the wheels on our Kenna Track assemblies are 7/8" round. The flat edge 3/4" won't work on your door track. The markings, "A" stands for the 1/8" offset and B stands for 3/8" offset. In your situation, we recommend buying a new complete sliding door kit like our 23-500. Look it over and let us know what you think.

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