They are a pillow blow bearing. The later discs had a pivot built into the bearing. This is an early version before that.
The bearing i need to replace is one that the PO replaced with an over the counter pillow block but the shaft is square not round like the bearing ID. Now I do not have the OEM bearing holder that I could simply just replace the bearing.
If we could get a model I maybe able to get a used part from Allstate Tractor Parts. They are a large Ag equipment salvage operation up here serving Wisconsin, N and S Dakota, Nebraska, Iowa, and Minnesota. One of there yards is just 15 Miles from me. :thThumbsUp-1:
With a model # it would make life so EZ.