Accessing Radio Connection In a 1969 Valiant

I might have missed something, but isn't there a flat nut under the volume and tuning control knobs? My '68 'Cuda already had the radio removed when I bought it. Anyway, here is the '68 factory manual description:

1- Disconnect battery ground cable.
2- Remove control knobs from front of radio.

On air conditioned models, remove the two outlet duct retaining nuts and remove duct. It is also necessary to remove the right defroster hose and hose bracket from back of radio.

3- Remove bottom screw from radio mounting bracket.
4- Remove left defroster tube.
5- Loosen top screw on radio mounting bracket and remove bracket.
6- Disconnect speaker and antenna leads.
7- Remove mounting nuts from front of radio.
8- Remove radio bezel.
9- Lower radio and disconnect radio power feed cable.
10- Remove radio from under instrument panel.