I couldn't find any vertical brackets for the Tradfri to mount it to my Besta cubbord. So I tried making my own, including some countersink screw wholes. The fit is very tight, so you might want/need to print it slightly bigger to make sure the screw doesn't get in the way of inserting the Tradfri. It's my first every upload, and hope it will help someone out.

Printed without supports on X1 Carbon with variable layer heights. The layers around the screw wholes didn't come out that good, so it might work just as well with default layer heights.