Why not fix yours. They all have the same common problems/failures. Loss of 4th gear (fixable in the vehicle). Loss of forward clutch (cracked fwd drum). Loss of reverse (poor quality oe reverse band). Planetary failure (common on vehicles with over 100+k-heat treat on sun gear improper) Tcc failure/codes-(worn out valvebody).
Depending on the date of production, the 03 is a crossover year for the transmission some of the 03 models have a input sensor and a non ferrous sun gear shell and is not interchangeable with earlier 4r70w's.
Car-Part.com list 16 different versions for a 2003 crown Vic.
Be careful with trying to interchange the models. If you do, match the tag.