Bottom slider replacement

A quick learner from NJ says:
I have a sliding door with bottom rollers. Want to replace the bottom piece. The track and door opening measures 46 inches. It looks like here only 48 is available. Is that exactly 48 inches or does it account for an inch gap on each side? If measured does it actually come out to 48 inches? is 46 available if that is the case?
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Paul from SWISCO responded:
Our track is exactly 48", yes, but you can cut off the excess with a hacksaw.
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