Andy, KG5RKP notes that you can retrieve a bezel pattern for any of the Nextion displays from 3.2 through 7 inches from Itead:
https://www.itead.cc/wiki/Nextion_HMI_Solution#3D_printing_bezel
Andy had a bezel printed by a vendor via 3D Hubs:
David Balfour has made bezels for the 2.8 and 3.2″ Nextion screens by 3D prints. His rig is shown above.
The larger bezel is on thingiverse if you have a 3d printer. https://www.thingiverse.com/thing:3342327