Not sure the spacers were necesary for the bumpout on my Westinghouse 40". After mounting, it appeared there was just enough space between the wall and TV to accommodate the bumpout without the spacers. Be sure to level the bracket attached to the wall while mounting it and be sure you have located the center of the stud. Also consider placing electric and cable/antenna outlets behind TV screen to avoid unsightly wires/cables. The long tool supplied to secure the final adjustment and placement is a real challenge. Otherwise the mount is great!