Deva SMS172-005 Sauris White Mono Sink Mixer's cartridge is NOT what the original picture's one. Either change the whole tap or go to the original manufacturer for the cartridge. But the problem remains: who is the original manufacturer?
There are several online resources where you can order a replacement. The problem is there are dozens of them available all with slightly different dimensions so you will need to measure the cartridge very carefully with a Vernier calliper in order the correct item.
So much simpler to change the tap, now all the simple and sensible things have been done... Only thing to be aware of is if the HW is mains pressure or from an unvented HW cylinder (low pressure), when some taps will not be suitable.
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