bottom roller for curved glass shower door

A quick learner from North Carolina says:
Does the 10-058 double roller take the place of a single bottom roller? If so, can we order just the bottom roller without ordering the whole kit?

thanks for your help.
Kathy & Carl
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Tom from SWISCO responded:

I believe the 10-058 is the modern replacement of your old part, yes. Unfortunately, we don't sell the individual components separately. I apologize for the inconvenience. 

SWISCO 10-058 Shower Door Roller and Bumper Kit
SWISCO 10-058 Shower Door Roller and Bumper Kit
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How to install the 10-058 shower door rollers
How to install the 10-058 shower door rollers
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