There is an online Kubota dealer called Messicks that is very good about selling and shipping to individuals. I have bought parts form them cheaper than my local dealer.
Is there a John Deere dealer that does the same thing?
Might try these guys?
https://www.tractorpartsasap.com/one of their subsidiaries had a part I need for an 80's MF industrial tractor
These folks helped me with some parts, and manuals too
https://www.jensales.com/categories/john-deere.html
For used parts, try Wall Lake Used Parts
For used parts, try Wall Lake Used Parts
there is a lot of mom & pop part stores that sell old tractor parts on amazon
I have bought some parts from Wengers in Pennsylvania. Good people to do business with. Also, Messicks.