A quick learner from Valley springs ca 95252 says:
December 23, 2020
Need to replace: U.S. pat. NO. D/M 3137028 A/S 3097401
Dave Sr. from SWISCO responded:
December 28, 2020
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.