DataComm Electronics
The Flat Panel TV Cable Organizer Kit-Medium comes with everything needed for installation:

Two (2) Medium Size (Dual Gang) Recessed Cable Plates

Two (2) Dual Gang Low Voltage Mounting Brackets

Mounting Screws

Installation Instructions

Note: You will need a sheetrock saw and screwdriver to complete installation.
Cable Organizer Kit-Medium
Flat Panel TV Cable Organizer Kit-Medium