There are holes ready under the roof liner for the brackets. I mounted the brackets to the guard and levered it up to where I judged it should be. Then probing with a sturdy needle trough the roof liner until i found the holes. Then cut the liner enough to access the holes where you have to insert a "pop -nut" as there are no threads in the hole. Pop nut in place the brackets can be mounted. Then it is easy to put in place the guard or remove it.