I received bottom track for my metal bifold door, 21-401. Note 2 photos. I think you refer to the pieces as floater and pivot ?
Your track is less wide as my old one. My floater piece (under the spring) is wider than the opening on the track and does not go in.
I want to order the 2 parts (floater and pivot) that fit with my new track.
I don't know the item/part numbers.
Thank you.