Searching for Concave sliding door rollers no offset

A quick learner says:
These were mounted to the top of the sliding doors so don't know what offset is need for the ones that mount to the sides of the doors? Thank you!
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A quick learner says:
Are there different ones for the front and rear doors?
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Dave Sr. from SWISCO responded:

These are very old rollers that I don't think you'll be able to find anymore. That said, I have a few ideas.

Please take a look at the 23-154, which was commonly used on front doors, and the 23-155 for rear doors. You might be able to use this type of roller to replace the ones on your door. 

We also carry the complete track set up for closest doors like the 23-500. We carry the tracks in different sizes depending on the width of the closet. Take a look and see what you think.

Installing a Two-Door Sliding Closet Door Track Kit
Installing a Two-Door Sliding Closet Door Track Kit
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