Congrats on the 40X! We have a 40X as well and we love it!
To answer you question.....Remove the top drawer under the TV and you will see the mounting screws that go into the stand.
I have to ask.....why are you swapping it?
2008 Fleetwood Discovery 40X
2013 Harley Davidson Ultra Classic Limited
2004 American Ironhorse Texas Choppe