There are two sets of clips on the bottom of the bezel. There are small ones that the boot is supposed to be attached to. These are located nearest the hole where the boot goes through. The mounting tabs located around the outside of the bezel the boot does not touch.
Personally I just removed the original boot mounting tabs, pulled mine through and used heavy duty tape. You will never see the tape, and if you want it to be slightly more sealed up, toss some adhesive on there as well.
Sounds ghetto rigged, but works perfect, looks perfect, and saved me time and energy.