Installing Fiberglass Fenders '65 fastback

Pictures would help.

Are you talking about the brace on the inside of the rear of the fender? Or are you talking about the lip that mounts to the top flange of the engine compartment?

I'm getting ready to put on a two piece front clip on a '67 coupe. The reason I say two piece is, the hood is removable, but everything else is one piece. The front clip will be removable as well.