The 8" Post Extension can be added to any existing PRO Sled with Bayonet Connectors - it measures 1.75" in diameter and 8" in length. It comes with an HD Center Post Cable Extension installed that is used to connect the Electronics and HD Video Signal between your existing Junction Box and HD Center Post. The 8" Post Extension can be installed on either the top or bottom of your Sled, depending on where you want to add length.
