I purchased a couple of outdoor flood/motion lights from Home Depot (two in a box for $19). I went to mount them on the existing box but the holes don't line up to make it straight. Is there some kind of an adjustable bracket I can use? ie brackets screws to box, other part of same bracket with threaded screw holes swivels or rotates to mount light on straight. Lights have 4 holes to mount to a box, not one hole in the middle.