 The situation is further complicated by changes to the basis for computing power output in France (and elsewhere in Europe) at the end of the 1950s.A version of the engine, called "Rush Super M", debuted in September 1961 in two models - the Montlhéry Spéciale saloon and Monaco Spéciale hardtop coupé.The 90A Aronde was produced in Australia from 1956 by Northern Star Engineering which, along with Continental and General Distributors, had been contracted to assemble the model from CKD kits, using local content.