Direct Mount Kit for IKEA Skadis Boards. has the same Dimensions as the original spacers so you can combine with regular mounted boards.
I needed them because i cut a board in half and had no mounting bar. Also i did not like that the boards were hanging free on the bottom. with them it is rock stable.

your screw should be 4,0mm in diameter and about 28mm + what you want to go into your wall long.

so 17mm into wall means  a 4,0x45mm screw.        40mm into wall = 65mm long screw --> goes into wall 38mm