Difference between 23-222C and 23-222B

A home owner from Iowa says:
Hi,
What is the difference between (what does fixed mean)?
23-222C and 23-222B Fixed
Thank you
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Bob from SWISCO responded:

Good question. The manufacturer of these rollers, Stanley, likes to upgrade them every few years. There were several iteration of these rollers before the 23-222B. To be honest, it's not entirely clear why they keep updating these rollers, but we do our best to keep up, and in our opinion the 23-222C is the best and most versatile of the lot, so it's what we usually recommend even though we keep stock of the 23-222B as a backup option. 

A home owner from Iowa says:
Thank you very much.
A home owner from Miami, Florida says:
Just to be clear, you say that both the 23-222B and 23-222C are the best replacements for the Stanley discontinued Top Roller guide, but you didn't explain why you recommend the C over the B other than the C costs more than the B?
Are they the same size as the Stanley 00-5024 which is what I have in my doors? Can't you just replace the cracked rollers instead of the whole part?
Thumbnail of the uploaded file named Stanley 00-5024.jpg
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Tom from SWISCO responded:

I'm afraid that the wheels themselves are not sold separately. These are only available as a complete unit.

As for why we recommend the 23-222C over the 23-222B, it's simply because it performs better. It's a newer model that the manufacturer made explicitly to replace the 23-222B. The 23-222B is still a viable option, however, even if it doesn't work quite as well as the 23-222CIt's up to you which one you'd rather go with.

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