I am in a house that was built in the fifties. It has closet doors using your parts. The doors are hanging up. I haven't been able to find replacements. I am attaching pictures of the rollers and track.
Tom from SWISCO responded:
August 9, 2017
Your wheels appear to be flat. Take a look at our 23-009 and 23-020 closet door rollers. Carefully compare your measurements to ours and see if either of these could be a good replacement part for you.