How do you glue these back on?

I got a couple more. The upper headlamp cutout area on these is notoriously weak. I glued the pieces together, however slight flexing and they will break. I made doubler angles out of .016" 301 1/4 hard stainless steel sheet because it was nice and thin, yet very strong. Plus concidering its working 3nvironment, it wont rust. Adding the 90° angle to it stiffened it right up. I then sandblasted the bonding side of the stainless to rough it up. I ground the plastic back slightly , and sanded it with 80 grit sandpaper to rough it up so when the doublers are installed they bond well and are keeping the part at the same dimensions to fit flush back in the grille opening. Then with JB weld and a bunch of clamps i clamped it into place. This was done to both surrounds.

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