CC Outtake: The Real Mazdastang

As is well known, when reports surfaced that Ford was to replace the Mustang with what became the Probe, letters poured in deriding the so-called “Mazdastang,” forcing Dearborn to reconsider its decision to replace its pony car outright.  In a reversal of this scenario, Mazda’s RX5 flopped internationally when it was introduced in 1975, with detractors correctly pointing out that its design was a slavish copy of the era’s bloated American “personal luxury” coupes.  This Mazda 121, a piston-engine variant of the Cosmo/RX-5, was spotted by jpt.continentalmkii and reminds me very much of the Mustang II.  Tell me, is this the real Mazdastang?