I lost my only key to my car how and where do I get one made
If you bought it new the dealer will still have it on file, if not then your only choice is a locksmith that is mobile, he can come to you and "pick out" the cut for the keys and make them right there, it won't be cheap, but if you have full coverage insurance with towing you may get a partial reimbursement from your insurance carrier.
Search Mercury Cougar Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Mercury Cougar Experts