I'm not sure what track you need, exactly. The pin length unfortunately doesn't narrow down the list of possibilities too much; the diameter and style of the cap is a more essential detail. Would it be possible to see photos of the original hardware? Knowing the size of the cap would also be necessary.
All that said, we only sell a limited selection of bifold door tracks. See our 21-401, 21-450, 23-450, 23-461, and 23-509. Note that each such track is the shortest version of that style and we do carry longer sizes in each case. However these are the only designs we currently sell.
Your next step should be to review each product and see if any of them match what's currently in your door. We have detailed dimensions listed for each track that you can use as a reference for comparison.
Sure, you can see our full selection of closet door pins in this general style here. The section is specifically for wood bifold doors, but you can ignore that. I've seen this pivot style used on all kinds of doors, so that's not a hard rule.
Reviewing your photo, I think yours looks fairly close to our 23-118. The bad news is that we don't sell a track that specifically works for this particular pin. If this is a match for what you have, then we are unfortunately not able to provide a matching track.
