Sliding glass door wheel, 1972?

A quick learner from Valley springs ca 95252 says:
Need to replace: U.S. pat. NO.
D/M 3137028
A/S 3097401

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Dave Sr. from SWISCO responded:

Hello there. We do not sell that inner part of the roller by itself. We only sell them as complete assemblies. Take a look at the 81-258 with nylon wheel and the 81-258S with the steel wheel. See if this type matches what you need. 

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