Brooks, thank you for contacting us and submitting your photos.
We have spent the last few days researching possible replacements for both the top and bottom roller. Unfortunately we were unable to locate rollers with nylon wheels, therefore cannot recommend any replacements at this time. If we receive any updates regarding the availability of replacements rollers, we will post an update on the discussion board.
Thank you for your patience, and thank you for posting.
I would guess that I could use model #81-090 to substitute for my worn lower roller assembly as the only difference appears to be the metal roller. Do you have any assemblies with metal rollers that I could substitute for my worn top roller?