Roller for a Solidcore Bi-fold Closet Door

A quick learner from united states says:
I'm looking for a stay roller/roller guide to go on the underside of a heavy door. Needs to have a nylon wheel, 1/2" diameter. do you have anything that's a fit, pls? It's for a solidcore bi-fold wood door.
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Paul from SWISCO responded:

I'm not sure what it is you need, exactly. Could you possibly use something like our 23-218? If not, I'd like to see a photo of the original roller so that we can match up something better.

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