A Ford dealer isn't going to have factory
floor mats for a 15 year old car unless it is new old stock. Also, because less than 70k of these cars were made between 2002-2005, that's not a big market for an aftermarket
parts makers, but some small shops have them
https://forums.fordthunderbirdforum.com/tbird/tbird-custom-mats-kit/ or you can google 2001 Ford Thunderbird
floor mats.