This is the stuff I use.
https://www.amazon.com/Jagwire-Compr...s%2C158&sr=8-2
I'm sure you don't need 10 meters, but that is the correct housing. I just use Jagwire stainless cables with it.
I have the Spyres on 2 bikes and they are an impressive cable disc brake. Much better than the Shimano cable discs I have on my road bike bike and as good as the SRAM hydraulic brakes on another bike. (yeah, I have a lot of bikes)