Having problems installing VBox guest additions on CentOS 8

[JCS9924]

I have just started using VirtualBox. I am trying to get 2 virtual screens working on a CentOS 8 (8.2_2004) guest, which AFAIK I need the Guest Additions.

Searching through documentation it appears that I need to install the kernel-devel and kernel-header packages for the release I am one (which I have done).

When I run VBoxLinuxAdditions.run I get the following error:
Kernel headers not found for target kernel 4.18.0-193.el8.x86_64

rpm -q kernel-headers shows:
kernel-headers-4.18.0-193.6.3.el8_2.x86_64

uname -r shows:
4.18.0-193.el8.x86_64

I am on an air-gapped network so I am installing the packages through RPM.

Are there any obvious gotchas I am missing here?

Thanks,

[Martin]

Do you also have the kernel-devel package installed for this kernel?

[fth0]

I don't know the version numbering scheme, but is it ok to ignore the two differences "6.3." and "_2"?

[JCS9924]

I don't know the version numbering scheme, but is it ok to ignore the two differences "6.3." and "_2"?

Well that was a duh moment. ugh (not enough coffee today). Think my brain crapped out after installing perl without yum.