Brief Description: Firewall - Clecoe all the parts 4 Corner Strap
Then this little strap needs to be drilled. I beveled one edge so it fit snug against the stiffener. Then I held it in place with my fingers and drilled the first hole using firewall as guide. I clecoed and drilled the rest. Plan says just drill the first hole per some measurements, but I decided drilling it in place is more accurate for getting a match.