Having a link to these drivers might be useful some day. The zip file contains all necessary drivers for Sony Ericsson mobile phones listed in the title.

http://www.nxtg.net/files/sony-ericsson-k-series-drivers.zip

p.s.: if you're the kind of suspicious guy (which I understand), you may find these drivers in the full PC Suite software download available on the SE official website. Uncompress the archive in a temporary folder and you'll also find those drivers files.