Hey there,
Thanks for reaching out to us! We suggest converting your exisiting bifold hardware over to the Slimfold door pins. This means you'll need to replace the tracks along with the new pins.
For completing this repairs, we suggest doing one set of doors with a pair of tracks. This would require one 21-002 Bifold Door Pivot Pin and three 21-007 Bifold Door Guide Pins, per panel. You will also need two 21-277 bumpers and if the old bushings are worn you'll need to replace them with the 21-149 & 21-153.
For tracks, we have the 48" 21-404, 36" 21-401 and 60" 21-402. They are all the same style track just in different lengths.
The dimensions and design of each recommended part can be viewed directly on the website by visiting the links provided or by searching the product codes.
