SRAM NX 11sp cassette small cogs

I'll be changing the chain soon, and't I'm having difficulties finding the cogs on the cassette selling individually.
I want to change the 13,15,17t cogs because they are the most worn,
but from the failed search I assume you just chuck it whole and buy a new one?
I want to change the 13,15,17t cogs because they are the most worn,
but from the failed search I assume you just chuck it whole and buy a new one?
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I've bought from them and although they are in Germany they are very prompt and good prices - in sterling and English website.
Funny how SRAM boast it is a four piece cassette but you can't source three of the bits separately.
But next time it will be a Shimano cassette.
I've always replaced the whole cassette and never considered what was worn or not!
I do now have both bikes on XT cassettes anyway as I find them a bit bit smoother.