Replacement wheel?

A home owner from North carolina says:
Do you have, or can suggest somewhere, I can procure replacement wheels for sliding window roller part #87-143? I believe this part has a Wheel which is is 17/32x3/16 with a 3/16 inch axle. Need for replacing on Traco windows. Your part 87-143 measures as a replacement assembly but just need wheels.
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Paul from SWISCO responded:

I'm afraid that the wheel for our 87-143 is sold separately. I apologize for the inconvenience. It was mainly used for Traco sliding window Series TR-6000. It does come with one wheel, so you can use either the lower socket or the higher one to make an adjustment to the sliding panel. 

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