Searching for 31/4 inch wide by 72 inch long sliding bypass closet door track

Thanks for reaching out to us! The track shown here reminds me of our 23-270, 23-271, and 23-272. I'm afraid we don't sell a 72" version of these tracks but what you can do is butt two small lengths together and then cut off the excess. You can do so using a hacksaw. Take a look and let us know if you have any questions!