The 2000 Ford Taurus needs the use of two U-shaped metal keys. You should be able to find these at Walmart, AutoZone, BestBuy, or similiar places. Just ask for "Ford stereo keys" Should cost less than five bucks.
Derek
PS. A great source of information for Taurus owner's is the
Taurus Car Club of America. My username there is also d_sellers1 and I am also a 2000 Taurus owner. I have a few posts talking about the carput and two other users there are doing the same.
EDIT: Autozone part#: AW-FDRT $3.99