you cut off the mounting studs on the fender rails and drill and tap them for bolts
Cotton Mouth, just so you'll know, that method is more involved and more difficult. And, not nearly as quick to remove/reinstall the trunk mount as needed. With the method where you cut slots in the mount, you only have to loosen the nuts. With the second one you have to unbolt it unless you cut slots in the mount. Which in that case you might just as well use the first method.
