3M automotive double-sided tape.
As used by Ford and other automotive manufacturers and panel shops, to stick body kit etc. to cars.
I have a mate what stuck my old boot lip to his car using just this tape and it shows no sign of coming off.
I bought a role to fix my rear pods, but have almost finished it on other people's cars . I am due to buy a new role, so if you want, we can go halves, i'll help you fit the facia and keep the remaining tape, it's only about $15 if i remember right.