The mount consists of two separate hangers as you can see in the pictures.
They take every standard skateboard truck and also every longboard truck I tested with (Paris, Caliber) and every wheel size from park skate wheels to 90mm longboard wheels.
Adjust the distance between the two hangers according to your truck & truck width.
They are meant to be glued (or use strong double-sided tape) to the wall.

The author marked this model as their own original creation.