ciphergoth | Mounting a TV to the wall

I bought this wall bracket for this TV. I want to attach it to a brick wall. I'm a bit disturbed by how close together the top and bottom wall fixings are - it seems like it will work hard to pull the top fixings out of the wall. I find myself wanting to somehow attach vertical strips of metal with holes in to the bracket at either end making an H shape, and use the holes at the top and bottom of each strip to attach to the wall. Is this a crazy idea? Where online can I get such a strip of metal, and how would I go about it? Or should I just rawlplug it into the brick wall and not worry about it?