Group 34.
The Z takes a group 35 battery
group size 75
Should be battery Group Size 78.
BCI group size ( 58 )
Group 26
A ( 1981 ) Ford Escort takes a BCI group size ( 58 ) battery
The battery group is 65N for a 2003 Ford Windstar
OE is group size 40R, but it will take 96R as well.
fordparts.com shows BCI group size ( 56A )
group 65
Depending on which engine and accessories you have, it could take the group size 65 with 850 CCA, group size 59 with 590 CCA, or group size 58 with 610 CCA. More info is needed.
According to the 2008 Ford Taurus X Owner Guide : It came from the factory with the ( Motorcraft BXT-59 battery ) * That's BCI group size 59