We are in the process of converting item numbers, primarily on the dual component line, to a simplified system that will help with product determination between models and cartridge systems.  Product descriptions will also be updated with basic data for precise definition and clarification.  There will be a gradual transition throughout the line as stock updates are made on each model, with the full line transformation expected by year-end 2011. A cross reference spreadsheet will be updated as changes are made, as well as updates made accordingly throughout the website.  Thank you for your patience while we make the transition!