The marketing focus on the Falcon's relationship with the Mustang's design appeal led to Ford introducing a Falcon GT variant of the XR in 1967, featuring a version of the 289 in3 (4.7 L) Windsor V8 engine, sourced from the Ford Mustang. The GT marked the beginning of the Australian muscle car. All of the original XR GTs were painted in the colour "GT gold", except for eight that were "Gallaher Silver" and another five that were "Russet Bronze", "Sultan Maroon", "Polar White", "Avis White" and "Ivy Green". The non-gold GTs, while having the same specifications, are the rarest of the early Australian muscle cars.