I seem to remember when I fitted my bracket to the wall, the fittings came with it but it was a 32" to 50" and it is screwed into plaster/brieze block with monster screws.
Those fitting look ok but one thing I do with butterfly screws is put some plaster on the legs. This is because once you unscrew them they fall down the inside of the wall and you have to fit a new one.The wet plaster SOMETIMES holds the wings in place and sticks it to the wall....does that make sense?
