Just need wheel assembly

A home owner from O Neals, CA says:
We are looking for 2 wheel assemblies for an older set of mirrored closet doors. One door has two complete sets with wheels and works well but the other door is missing two of the slide on wheels. We have the part that is screwed into the closet door, just need 2 of the wheel parts that slide on (can be seen clearly in 3rd picture). There are no markings on the wheel assemblies. Have done searches online but cannot find the part. If the part is no longer made and can't be found, is there something else we can replace it with?
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Dave Sr. from SWISCO responded:

Thank you for reaching out to us! I recommend you have a look at the 23-074. Yours look similar to this one but review the dimensions and see if they match up. 

If not, you can consider the 81-228 and the larger 81-236 along with the 81-310 axle kit. 

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