Finding the correct atomizer

I am just a beginner at vaping and I am using the K3 starter kit, which comes with a spare atomizer.
I have now used that spare and want to buy new replacement ones, however I can't find them!
All the different atomizers have names, but I can't find any that are K3! If there is another name for this, I can't find it.
The numbers I see through the glass are: 4.2- 5 and 10-14W.
Can anyone help please?
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