Check your local Ace Hardware, Home depot or Lowe's. They carry a lot of these parts.
ken
Amateur Radio Operator. 2023 Cougar 22MLS, toted with a 2022, F150, 3.5L EcoBoost, Crewcab, Max Tow, FORMER Full Time RVer. Travel with a standard schnauzer and a Timneh African Gray parrot
I had same problem with my Jayco. I found the name of the shower door manufacturer on the door. I called them and they were able to get me new rollers. I did see some rollers at RV store after repair was made.