pocket door roller

A home owner from Iowa says:
I have pocket door roller that i have to replace. on the roller it states 1300 Kennatrack. I am looking for the sprocket, spring, and bolt for this assembly. i looks pretty close to 23-138. I have attached some pictures for you to reference.
Thank you
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Bob from SWISCO responded:

The 23-138 is indeed our closest possible match to this four-wheel pocket door roller. Review the dimensions to ensure it matches up. Let me know what you find. 

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