They will NOT work. The belt tensioner is different and bolts up completely different from 98 to 01.
This:
Crown Victoria '00-02
Grand Marquis '00-02
Lincoln & Town Car '00-02
Mustang '00 8-280 (4.6L), (SOHC, GT, VIN X)
Mustang '01 8-280 (4.6L), SOHC (GT, VIN X)
Mustang '02 8-280 (4.6L), (SOHC, GT, VIN X)
To this:
Cougar '96-97 8-280 (4.6L)
Crown Victoria '96-99
Grand Marquis '96-99
Lincoln & Town Car '96-99
Mustang '96-97 8-280 (4.6L), SOHC (VIN X)
Mustang '98-99 8-280 (4.6L), SOHC (GT, VIN X)
Thunderbird '96-97 8-280 (4.6L)