A store bought window box won’t go around corners, but The Window Box Mounting Kit makes it a snap.
The Window Box Mounting Kit comes in two styles:
Slope Front and Vertical Front
SLOPE FRONT SET
Kit includes a left and right support bracket, with a
25 degree angle front flange; 2 each 3/8" x 3 1/2"
lag bolts, 8 each 3/8" x 1 1/2" lag bolts (to attach facia)
$34.95/ set [+$18.00 s/h]
VERTICAL FRONT SET
Kit includes a left and right support bracket, with a vertical front flange; 2 each 3/8" x 3 1/2" lag bolts,
8 each 3/8" x 1 1/2" lag bolts (to attach facia)