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Hi Jit, you can find the cyan toner for the Ricoh SPC 311N on:
https://www.tonergiant.co.uk/product/Ricoh-406480-Cyan-Toner-Cartridge-406480-5613/
or
https://www.tonergiant.co.uk/product/Compatible-Ricoh-406480-Cyan-Toner-Cartridge-RE406480-86544/
Either options will work correctly.