Kings Brand Bed Frame Headboard Bracket Modification Modi-Plate ~Set of 2 Plates~ Kings Brand Bed Frame Headboard Bracket Modification Modi-Plate ~Set of 2 Plates~. Plate is designed to attach your standard bolt-on headboard brackets to odd-sized headboards. Perfect for special projects or unique headboard sizes Dimension:4"W x 6.25"H. To attach Headboard and Footboard you will need two sets.