 The stolen interceptor driven by the Nightrider in the opening  scenes is another production vehicle; it is a "HQ Holden Monaro",  which was sold in Australia in the early 70s with a variety of  motors including large capacity V8s. Also, the other police  vehicles in the movie were sedan versions of the XB, although one  was the previous model "XA". They also had 351 cubic inch motors and  are a common car on Australian roads.