Thanks for your interest. The 210 is used mostly for oranges and like size pieces of fruit. The 500 can be used for much larger fruits like grapefruits, etc. Let us know if you have any other questions. Thanks!
The strainer cone can be found here: https://www.etundra.com/restaurant-parts/prep-equipment-parts/juicers/ra-chand-j210c-j210-strainer-cone/. Other Ra Chand parts can be found here: https://www.etundra.com/ra-chand/restaurant-parts/prep-equipment-parts/juicers/. If you're not finding what you need, let us know and we'll special order it for you.