There are three products on the following page that are the correct toners for your printer.
https://www.tonergiant.co.uk/model/Samsung-ML-2165-toner-cartridges/The toner at the top of the page is a standard capacity compatible toner (not manufactured by Samsung), the middle product is a high capacity Samsung toner for large print jobs and the product last on the list is a standard capacity Samsung toner. If you need any more help, please let us know.