Stanley Mirrored bifold door tracks

Your site has been very helpful to us. We have an old metal framed Stanley Mirrored bifold door (36"x80"). We just replaced our carpet with engineered flooring and the opening has been reduced to EXACTLY 80" tall. We've been struggling to get the old door in place but realized that our roll guide for the bottom track is broken. We're not sure if anything else is. 

We came upon your site and saw the low profile track. We were wondering if we could install two low profile tracks rather than the larger track that previously was installed at the top (Pictures attached). It appears that the only difference in our old tracks is the spring at the end of the top track. The lower profile might give us the extra space for the door and make it easier to install. We'll either need to order two low profile tracks or just the guides. Or do you also have a different track replacement for the top? Thanks for any guidance; really appreciate it.

Good afternoon.  I have the same doors.  I am in need of the pivot points in the track.  They appear to be nylon(?) and are like the ones in this person's picture!  Any help available ?

No, in the track, where the pins go into to swivel or pivot. Look at the 2nd photo.  The end of the track has a 3" long nylon peice inside it. There is a hole in that for the pin to pop into so the door can pivot to open. One on the top, one on the bottom. Does that clear it up? There is a top and bottom pivot point.  The replacement things I can find call it a pivot bracket.
 

We are making progress!!! Thank you for you refforts and patience.  Are those braackets the same for top and bottom?