API Rack Ears are now available in two versions; one for the previous generation lunchboxes and one for the current generation. Confused? It's easy to tell which model to choose. In previous generation lunchbox models, the serial number will have "6B" in it. If that's the case, previous generation rack ears (product number 920-0859) are the ones for you! Current generation rack ears fit lunchboxes with the re-designed power supply (product number 920-0737) and will have "HC" in the serial number, as well as a pair of db-25 connectors on the back. All rack ears are available for $49 MSRP. Rack 'em if you got 'em!