I need new tracks and hardware for bifold mirror doors

I have two 4 foot openings with double mirror bifold doors and one 18 inch opening with one bifold door. The tracks are rusty and warn out, from the late 70s early 80s I believe. They are heavy doors and have tracks on top and bottom. What can i get to replace them? The pin hardware on the doors seem to be in good shape, nothing broken or missing and all seem to spring back as they should.

Thanks

Brian

Here is a cross section of the track. Track is on top and bottom of these heavy mirror doors. It looks more like your 23-510 track but that says its good for doors up to 30 lbs. It might be heavier gage metal. It is 1 inch wide and 1/2 inch tall. It doesn't look like your 21-455 which looks like its heavy duty and made for metal doors with mirrors. Should I replace all the tracks and guides with your heavy duty ones or stick with the same style we have now? All the weight is on the pivot pins anyway, right? The guide end is just for guiding the other end.

I wanted to confirm that the bi-fold door top slide guides 23-130 work with your track 23-510. Our current configuration includes these guides on top and bottom of the doors. I know it says top slide guide but will this work for top and bottom? As I mentioned, the doors currently have tracks and guides on top and bottom.
Thanks,