Build a linux module without source code

Question

I just wonder, whether it is possible to build/ to insert a module without the source code. Say I have downloaded an openSuse operating system, and the kernel source code did no

Answer 1

It is unclear what industrie you're talking about. Why do they use linux? Where - on the server, on the client? As desktop system?

If they know that they might need to build modules - why don't they have kernel sources?

I don't know specifically for OpenSuse, but for Ubuntu, you can download the kernel headers for the current patchlevel of your kernel. Then you can compile modules. It's not hard to find them in synaptic, the software repository managing program.