For some reason the '01 & '02 springs are particular to those two years, having a code 1 & a code 2. The '03 thru '05's I've looked at all seem to have a code 4. Is yours a code 14 or 1144 (same thing, different year coding).
Go out and look on the bottom of the lower leaf and check the stamping number. It will probably read 4L24 BA. On my '01 & '02 it was on the leaf behind the axle, on the '05 spring it was in front of the axle.
