say larry why dont you come over to my house and help me......lol    im trying to follow you but im a bit lost. I can not walk and chew gum at the same time. so please help me. I need you information. 

You'll need to spit that gum out...
Just kiddin...
If your car still has the original type bumper cover, which is flexible urethane, it's gonna be hard to modify it to accept the bezels. If you have a fiberglass replacement type bumper cover, then Larry's idea will work.
What he is saying is you will need to build up a "lip" on the  bumper cover once you cut the hole. The "lip" will give you a place to bolt/screw the bezel to.
Perhaps we can come up with a drawing or something to help visualize this. I'll see what i can come up with later this eve., if no-one else does first.

ha ha im spitting out the gum!  im all eyes and ears

I should have clarified that I was assuming you had fiberglass bumper cover if you were planning to put a bezel in it.  If you have urethane, the same instructions apply, but instead of fiberglass you use a urethane bumper repair kit or two.  I have been looking for a good diagram.  I will see if one of our people can draw something I can scan and post.  As Joel said, all you are trying to do is build a little lip to screw the bezel to, and using the new bezel as a mold.

Larry