Where can I find proper linux-headers for Debian Desktop?

The linux-headers for Debian Desktop do not match the kernel

uname -a
Linux wifi 4.4.154 #13 SMP Mon Nov 5 18:25:35 CST 2018

but, the best I could find was this recommendation below.

Debian repositories - Debian repositories
"By the way, we have updated a new kernel image. Package “linux-headers-4.4.154-10-g209c242-dirty” is recommended.
aarch64 GNU/Linux

Where do I find “linux-headers-4.4.154” – or what is the proper way to install a the headers above?

You can install the linux-4.4-latest package. It will install the latest kernel image and kernel header.