Docking stations and acessories for iPods are everywhere in the marketplace, companies cashing in on the popularity of Apple products, examples include Gear4/ I Want It/ Logic ect.
"This adapter is designed to enable any iPod model to connect to the iPod Universal Dock and other products that use the Universal Dock system. You simply insert the Dock Adapter that fits your particular iPod model into the Dock, then plug in your iPod. When you want to connect a different-size iPod, simply pop out the Dock Adapter and insert a new one."
Apple.