I cut out the NACA vent which is installed on the top cowling and cools the electronic fuse box on the firewall as near as I can tell.
It's basically the same process as with the cooling fins.
I checked to be sure it doesn't interfere with the fusebox/voltage regulator (plenty of clearance), drilled holes, sanded and cleaned the area to be bonded, then mixed up some epoxy and flox and stuck it in place.