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Hi there, any of the 4 toners at the top of the page (the bottom 2 products are maintenance items) here can be used: https://www.tonergiant.co.uk/model/Brother-DCP-8045D-toner-cartridges/
The difference between them is that there are 2 different sizes (printing either 3500 pages or 6700 pages) and each comes in original Brother or TonerGiant compatible.