kernel-source from home:tiwai:kernel:sle15-sp5-kasan project
Select Your Operating System
Add repository and install manually
For pool run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:tiwai:kernel:sle15-sp5-kasan/pool/home:tiwai:kernel:sle15-sp5-kasan.repo zypper refresh zypper install kernel-source