Bottom roller for closet door, roller is concave

A quick learner from Atlantic City,N.J. says:

I could use 4 of these. They are recessed in the bottom of a hollow core closet door. It's a 1/2 wide, roller is 5/16 wide.

User submitted a photo of a closet door roller.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting, Chris. Have you seen our 23-218? This appears similar to your own roller. Compare the two to see if this can work as a replacement.
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