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Hi there Mike, thanks for your question. The HP M281fdw printer can use either 203A or 203X cartridges. The 203X cartridges are a high capacity version where the 203a toners are standard. The cartridges are physically the same size. We do sell the 203x compatibles which are £167 cheaper than the originals (currently). You can find them here:
If you need anymore help, let me know!