kernel-source-2.6.5-7.111.src.rpm is not the package you want! The 'real' source package is kernel-source-2.6.5-7.111.i586.rpm
All packages with 'src' are also source packages, but more complicated to use
If you have 9.1 Personal, the kernel source is not on your medium, so you need to add a FTP server to your installation sources, or download the sources directly from the server. Since you are using an updated kernel, you'll find the correct sources in the 'update' directory of the server, not the standard path (eg. ftp.suse.com/pub/suse/i386/update/9.1/rpm )