Buying parts locally is a big problem, most of us these days get them from the USA which is where the cars were built.
I can recommend the following companies who will ship to Aust. remebering that in the US Cougars were sold as Mercury Cougars.
http://www.rockauto.com/catalog/rafr...0&model=COUGAR
teamfordparts.com
However some parts have to be sourced from the UK (fuel pumps for one) and I think alternators are another. The above companies are great for day to day parts and will deliver to you within seven days.
So really the internet becomes your BFF as long as you own a Cougar.
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Owning a Cougar is like owning a Super Model
Good to own but "High Maintenance"
2000 Model Eibach Cougar (Auto) - Now dead & buried