Shower door rollers

A quick learner from 33321 says:
Can i just replace the PLASTIC that goes around the roller itself, or do i have to replace the entire roller?
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Bob from SWISCO responded:

I am afraid we don't sell these roller assemblies without the wheels. You'd need to buy the entire component, such as the 10-071 or 10-075. I apologize for any inconvenience. 

10-071 : Shower Door Roller Assembly, Round Door
Shower Door Roller Assembly, Round Door
10-071
$12.75
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10-075 : Shower Door Roller Assembly, Lateral Angle Door
Shower Door Roller Assembly, Lateral Angle Door
10-075
$12.25
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Installation Instructions for the 10-071 Shower Door Roller Assembly
Installation Instructions for the 10-071 Shower Door Roller Assembly
GUIDE
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