I did not see any numbers or markings on these roller assemblies.
I actually could not find any markings or model numbers on the sliding door itself either. But I do know it is made by Pella. I suspect it could be from around the early 1980's.
For some basic dimensions of the roller assembly:
The sheet metal base is approx. 1.68 inches tall and appro. 0.667 inches wide.
The metal roller has a diameter of 1.5 inches.
Thank you,
John
