[BUCKEYE COBRA]

MDP 727,
I had the same problem when installing my PCV valve. The poor guy at NAPA spent 30 minutes and found me a grommet that worked OK for $2. Look in a Ford Racing Perfomance Parts Catalog. PN M-6892-E looks like it is designed for this.
Your Cobra 2in badges can be purchased from many of the part places that advertise on this forum for $15-16ea. These are installed by two mounting pins and retainers. I installed mine by:
Applied masking tape (to prevent chips)
Drilled pilot,then proper size holes
Applied clear silicone to holes
Inserted badge and retainers on the back.
I mounted my fire ext in the same location as you are looking at with stainless steel self taping screws 3/4 in long.
Good Luck,
John
PS. Drilling in that New Cobra requires a beer (or two) from the resulting stress aftewards. I was pretty nervous........