sliding mirror door parts

A home owner from California says:
We have sliding mirror doors whereby the plastic wheels are breaking due to age. Picture of the wheel is attached. I have measured the wheel and it is 1 1/4" in diameter. I believe your item #23-043 is a match. Please confirm your thoughts. And what is return policy? In addition, the plastic piece at the top of the door which helps it glide within the channel is starting to break. Do you have an item for replacement? Picture is attached. Thank you.
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Emily from SWISCO responded:

Hello!

Thanks for reaching out to us. Our 23-043 is a great pick as long as the dimensions match up. You can view our return policy here

I'm not sure I recognize the top piece in your second photo, however. Is there more to it, like an assembly? If so, can we see photos of it? 

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