Manufacturer Part #: CAB-PS2-6MF
Mouse and keyboard extension may be more critical than you realize. People will spend years at a desk where the keyboard and mouse are just a little short. They spend so much time adjusting and pulling on their keyboard to just squeeze another inch or two so they can type a little easier.
Don't put your hardware at risk by ruining the PS/2 connections and damaging the keyboard. All you need to do is simply get a PS/2 extension cable. Then you can finally rest your keyboard and/or mouse where they are most comfortable for you. Let's not forget that you are more susceptable to Carpal Tunnel and other hand and arm nerve problems if you aren't typing in a comfortable position.
This PS/2 cable from Gefen is six feet long and has male to female connections so you can extend your current cable length. Most keyboards and mice have permanently attached cables with a male connection end, so a male to female cable will add more length to your current cable.