You could also get a Barracuda with all the "S" options (except badges) separately. That is how my old 66 was optioned. Commando 273, four speed, handling package, tach. It also had discs. Oh, and no rear cutout on the 66 anyway.
The non Formula S '65 cars with the Commando 273 were called rallye pack cars. I have seen them without the swaybar etc. Non formula S cars,and Valiants didn't have a bright trim on the resonator-it was black on the one's I saw. Gib