just purchased an 1989 towncar yesterday with 101000 miles for 550. my question is how can u tell if its just a sedan or sig. series, or cartier?, on kbb.com it said all of them have alloy wheels, however mines has silver hubcaps, which makes me lead to believe its just a sedan, plz help. thanks.

the Signature series usually has a badge behind the rear window on the vinyl roof that says as much. They also have a half vinyl roof as opposed to the full vinyl the standard sedan has.