the choices in '74 were AM, AM-FM mono, AM-FM stereo (red-dot). All F-bodies as far as I know had two speakers holes in the rear metal shelf but not it the package tray cover. None would have more than a front speaker and a driver's side rear speaker installed
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'72 Formula 455HO TH400, Revere Silver, black deluxe
'74 Trans Am SD 4 speed, Admiralty Blue, blue deluxe
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