I owned a 2000 model Cougar for 12 years (that's mine the "dead one") and can recommend Rockauto.com for any and all parts you may need.
If you are going to do an engine swap then you should join newcougar.org where this subject is covered extensively and where there are plenty of other guys who have done it.
Good luck with it.
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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
