old closet sliding door track part

A home owner from livermore, ca says:
the white plastic piece slides up&down, clicks into the track to keep on the track. I think this is a 30+ year old door so not sure whether to replace the entire part of just the white plastic portion that clicks into the track.
No part # or serial number anyhwere I can see.
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Casey from SWISCO responded:

Hello,

Take a look at our 23-021 bottom guide and see how the dimensions on our product page compare to yours. Thank you!

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