Acme 30-1001 4 wheel roller

A home owner from Texas says:
Hi- Do I need any additional parts for this broken roller- I am not certain what the small piece is or what to replace it with. I have two pocket doors that are together .

I believe I need the 23-161 part.

User submitted a photo of a pocket door roller.
Profile picture of Dave Sr.
Dave Sr. from SWISCO responded:
Hello there, Robin. Your roller does in fact show some similarities to our 23-161. Give it a closer look along with our 23-162 pocket door bracket. Let us know if you believe these would work well as replacements for you.
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