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Bob from SWISCO responded:
April 14, 2024
Hey Lisa, maybe I can help. It looks like you have a track with raised rails, meant for rollers that have concave wheels. Concave wheels are wheels that have grooved edges, so they can run on rails. If that's the case, I think the 23-271 71" track might work for you. The overall shape might differ a little from your old track, but if the rails are the same distance apart then it should work. See the diagram below for reference. Bear in mind however that the overall track size can cause it to push against existing carpet, like what's in your photo. 
Profile view of bottom concave roller track
As far as the roller, I believe you might be showing the inner portion of an assembly like the 23-098, but look it over and see if you agree. Let us know if you have any questions about any of this. 
Dimensions for 23-098
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