window wheels

A contractor from California says:
hi there ,
can you pleas verify what type of wheel is it?
you can let me know a few options if you are not sure,
i dont have any information on the window type.
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Emily from SWISCO responded:

Hello!

I'm afraid I can't say for sure with your roller assembly still installed. Too much is obscured, unfortunately. The 87-036, 87-190, and 87-221 come to mind but they're just educated guesses. You will ultimately need to remove yours and compare the specifications to confirm if one of our rollers is a match. 

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