Abstract: An assembly kit for installation of two column trays in a column with an upper column tray can include at least one first downcomer with at least one downcomer wall, and with a lower column tray which is disposed vertically spaced beneath the upper column tray and connected thereto. The assembly kit can include at least one column internals mounting angle having at least one first mounting point, at least one second mounting point, and an adjustment device for adjusting a vertical distance between the at least one first mounting point and the at least one second mounting point, where the column internals mounting angle is attached with the at least one first mounting point to the downcomer wall and is connected with the at least one second mounting point to the lower column tray.