Available parts for the Jack LaLanne Power Juicers can be found here:

https://www.unitycart.com/pjss/parts/parts_classic.asp

You might take time to browse the site, you will find How To videos, manuals, Tips and recipes.

Been out of stock for over a year.....Good luck finding one. I have tried Ebay, Amazon and searching the web. The customer service department is useless, nasty and hangs up on you. Facebook gets you nothing but "I'm sorry you are having such a problem"......
My advice is sell the unit to someone whose is broken and buy one where parts are more readily available