There is also the 19#ers. The 19# injectors are 11% larger than the 17# injectors and on average will flow ~10% more fuel if swapped out.
The 3L has the 24#ers in em but they must say 4260 283 2f1e 11 on em to be 24#ers. Some people think they have 24's but here are the codes for the others.... Box Code Injector Size
OLV1 16lb
RXR1 22lb
ITW2 21lb
AEA2 21lb
NCB0 21lb
They should be available at a local boneyard if you want to get em there.
Here is a little bonus info for ya.. Earlier 3L Duratecs (96-99 split port) used 24lbs injectors with a narrow spray pattern. After 2000 all 3L Duratecs began using 19lbs injectors with a wide spray pattern.
Hope this helps a little bit.

1998.5 SVT contour #5979 3L 1995 Mercury Mystique 2.5L auto, all ghetto fo sho