I have a component that uses a wall wart power supply that provides DC 5V 2.6A. The DC end is 9mm long, 3.5mm outer diameter and maybe 1.3 inner diameter. I've looked around and can't find anything. Called local electronics supply stores too but no luck.

This would power a fiber optic USB extender. The power supply is for the receiver end that translates the light signal back to electric. It also supplies power to USB devices plugged into the receiver end. The transmitter end is powered by the computer.

Here's a link to the product in question...
http://industrialcomponent.com/opticis/opm210010.html

 

It does not have to be 2.6A exactly, any current rating higher than that is OK. If you can find a 5V 3A adaptor, for example, it would be fine.