Roger that. For anyone else, I meant upper grille removal/what he is doing at 6:14-6:22 in this video:
The biggest flathead I could find made things easier.
Although you didn’t ask me, I hope you don’t mind. This is the one I purchased: https://www.ebay.com/itm/For-18-19-Ford-Mustang-Bullitt-Style-Glossy-Black-Honeycomb-Upper-Lower-Grille/183545734018?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649
Danno1, the cervinis grille might be what you are looking for. They are quite popular. Cervinis makes an upper and lower https://www.beefcakeracing.com/cervini-4463mb/
Also, Rapid Red, perhaps this picture will clarify the specifics ford performance/chromeless bullitt grille for you. (Mine...