These API Rack Ears for the 500-6B 500 Series chassis is the right way to put your Lunchbox in your rack. Made in the USA, these rack ears are specifically made for 500-6B & 8 slot Lunchboxes produced from 2010 on (with "HC" in the serial number on the back panel). Made from aluminum with a durable black coat, your Lunchbox will be safe in your rack with these API Rack Ears. Key features: Aluminum rack ears Black finish Made specifically for 500-6B & 8 slot Lunchboxes produced from 2010 on (with "HC" in the serial number on the back panel) *Note: Current models, which were produced after 2010, feature both XLR and DB25 connections and "HC" in the serial number on the back panel and measure 13.9" X 5.25" X 7.25”. Previous model lunchboxes will not list “HC” in the serial number and measure 12.4" X 5.25" X 7.25” and will not fit these rack ears.