I am trying to replace my front passenger.

If you have a wire-feed welder and an acetylene torch, heat the bolt head for about a minute, then pass the torch off to helper and quickly hold a nut on the bolt head with a pliers, then weld through the hole in the nut onto the bolt head. You need to heat the bolt so the weld will penetrate. As the weld builds up, let it fill in the hole until it starts to melt into the nut. Once it cools you'll have a new hex to put the socket on. If the nut breaks off, try it again with another nut. I've had to resort to as many as six tries to get one to work.