A professional from Morrison, CO says:
July 21, 2014
The track I need has an outside dimension to outside dimension is exactly 3". The two ribs inside the old track where the rollers rest are 1 3/4" apart, center to center. Your track 23-271 is smaller. The outside dimension is 2 13/16" = 3/16" smaller than the old track. The new ridges that the rollers would ride on in the new track are 1 5/8" apart from center to center. What product code should I order?
Tom from SWISCO responded:
July 22, 2014
Thanks for posting. I think our 23-258 may have been a better choice for your track.