Attached are some pictures of the roller from my sliding glass door. I do not know the manufacturer but I am pretty sure the door was made in the mid to late 70's. Please let me know if you can find the part for me.
Tom from SWISCO responded:
January 15, 2021
Your roller is similar in design to our 81-256, but I can't make out your exact dimensions from these photos. I recommend reviewing the measurements we show on the 81-256 store page to confirm if this matches up to your part.