The Samsung no-gap wall mount is sold entirely on its ability to have “no gap” between the frame Tv and the wall, so any suggestion to span the stud gap with external wood is a no-go as it will push the frame off the wall and leave a gap. I would Just send the bolts into the stud on one side, and use toggles on the other side, that tv will be rock solid. Source: 5 years of AV install experience, personally installed dozens of frames including my own and several for family members.