Just like it says... the lip on your covers goes out
and you can use a 3/4" long bolt/or stud... on mine the
lip is turned inside(this moves the vertical wall out
farther) but I have to use a 5" long stud to come up to
the top.. here is another pic.. if you see you have a lip
of the cover that is outside that I dont have(thats where
you bolt yours on)