The photo shows the master 'smart' dimmer, but you purchased the remote 'smart' dimmer that is slave to the master dimmer.
So you are correct, that is not the correct dimmer for a single-pole application.
Cooper brand Aspire dimmers are available in 'Smart' dimmer and just plain old dimmer.
Smarthome has a plain old aspire dimmer
http://www.smarthome.com/21530S/Aspire-9530DS-600w-Slide-Dimmer-Desert-Sand/p.aspxGoogle products also shows the Lutro Maestro dimmer
http://www.google.com/products/catalog?q=maestro+dimmerLowes and Home Depot have ordinary dimmers also.
Both the dimmer linked to above will work for your single pole application. Keep in mind, they also work for 3-way applications so there will be an extra wire.
Since you know the phrase 'single pole' I suspect the wiring for you will be a cinch.
If you need assistance with the new dimmer, add a comment and I will answer.