Are you leaving the bumper's shape alone? If yes, are the original lights still in the holes or have they been replaced? Do you want the LED to go into the front edge of the bumper? If yes, do you want to eliminate the parking light opening? I have quite a few different LED light possibilities.
If you can let me know what your ideas are in a bit more detail, I could possible make some suggestions that will follow your needs. If you want to keep your concept off the radar, shoot me a PM or a note to my AmeriSport email and we'll go stelth.
I have 2 lights that are half as thick as the one below in the L bumper that should fit nicely in the edge of a pre-L bumper-et