Thanks guys!
I took the time this evening to finish installing the bow tie in the grille.
I used 3/4" plywood end cap, made of aluminum. I cut two pieces down to fit inside the emblem, carefully measured and drilled for the factory studs, then used push on nuts to hold the channels to the emblem. I drilled a hole for a bolt on the opposite end of each channel. I also cut two more smaller pieces for the back side of the grille and drilled holes in them so I could sandwich the front and back pieces around the grille bars. This pic of the back should help with the explanation...
I used 1/4-20 bolts, lock washers and nuts, tightened them down and added a nyloc nut as a jam nut. Shouldn't go anywhere.
This is the front piece. Notice the v-cut... I did this to bend the channel to match the angle of the grille. This isn't completely tightened down yet.
Here's a view from the top... Flush!
I'm pretty happy with it. This will be easier to take off if I need to.