King Modi Plate Parent The King Modification Plate is designed to attach queen bed frames to king headboards, or king bed frames to queen headboards. This comes as a saving grace for special projects or unique headboard sizes. The steel construction creates a heavy-duty connection, securely fastening the headboard to the frame. This set includes two modification plates. L : 11 - W : 9 - H : 6.5 - W : 33