Milgard Vinyl window roller wheels

A home owner from California says:
My roller assemblies for my Milgard windows (from circa 2004) are in great shape but the wheels are in bad shape.

How can I get wheels? If I cannot just buy the wheels, which assembly would be good to buy to take the wheels out and use in my assemblies?

My wheels are 1/2 inch in diameter on the outside (so maybe close to the 7/16 variety) and the wheel shaft is 3/16 of an inch in diameter. The wheel itself is 3/16 inches wide and it is 6/16 inches wide at the ends of the shaft.

Any solutions or suggestions?
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Tom from SWISCO responded:

Looking at your second photo, your roller housing looks like a match for our 87-201. Look this part over and see if this would work as a replacement.

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