On the Festool website you can look for spare parts and order them through the service department. Just type "EKAT" or "spare parts" in the search box of the Festool USA website.
"Replacement parts can be ordered from your preferred Festool dealer or by calling the Festool Service Department toll free at 1-888-337-8600. We are also available to answer your questions or to help identify the parts you need Monday-Friday from 8am - 5pm ET."
I've bought various parts thru Festool Service and they are GREAT. Just call the number, they will even help find the part #. It was actually Bob Marino that had me call regarding a track issue and two days later I had a new track.