I have got parts from Schaffer Ent. in the past.
There located in So. IL.
Not sure where your at but they ship.
They usually have a far amount of Case Equp.https://www.sewlparts.com/
Also Chartrand Equp. might be of help.http://www.chartrandequip.com/red-bud-il-dismantled-machines?_rdr
Try google for case crawler parts might find something close.