firewall hole to run siren wires?

I am installing an alarm in my 99 miata and need a hole/grommet to run the wires through.(99 5speed)
I will need to probably put some sort of heat tube around it to protect her. but thats another story

please help me, thank you

I am putting in an rfid alarm so when I walk away from the car it arms and locks the doors

when I get close to my car(10 feet or less) it unlocks and disarms letting me in

if a hole isnt easily found I will put the siren inside the car to annoy any thief lol

Its not to hard to find one. I stuck a temperature probe for the mirror through the fire wall on the drivers side. Just pierce the boot where the main wiring comes through.