Searching for Standard-Keil 81 - 1 3/8 bipass door rol

A quick learner says:
Good Afternoon,

I need to replace 4 of the assemblies in the picture for two wood bipass doors. Home was built in 1958. The info on the part is:

Standard-Keil 81 - 1 1 3/8.

Thank you!
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Paul from SWISCO responded:

Hello! Please take a look at our 23-010 roller assembly that comes with a 3/4" flat nylon wheel and 1/2" offset bracket. If this doesn't match up with your part, then get back to us with the measurements you are looking for and we will continue searching for you.

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