Someone linked this doc which is another piece of the puzzle.
It confirms that each model gets different part numbers according to total weight and or weight distribution...
Lowering Kit - P/No STIGLOSKIT05 - MY06-08 Liberty 3.0R Spec B (Sedan 5AT)
Lowering Kit - P/No STIGLOWKIT05 - MY06-08 Liberty 3.0R Spec B (Wagon 5AT)
Lowering Kit - P/No STIGLOSKIT06 - MY06-08 Liberty 3.0R Spec B (Sedan 6MT)
Lowering Kit - P/No STIGLOWKIT06 - MY06-08 Liberty 3.0R Spec B (Wagon 6MT)
(The 3.0 R Spec B Lowering kit comprises lowered coil springs that are both firmer and lower than standard fitment. Vehicle ride
height is reduced by approximately 15mm, thereby giving an aggressive stance. Springs come in STI’s trademark ‘Cherry Red’ colour for instant recognition.)
Lowering Kit - P/No STIGLOSKIT07 - MY07-08 Liberty GT Spec B (Sedan AT & MT)
Lowering Kit - P/No STIGLOWKIT07 - MY07-08 Liberty GT Spec B (Wagon AT & MT)
(The GT Spec B Lowering kit comprises lowered coil springs that are both firmer and lower than standard fitment. Vehicle ride height is reduced by approximately 15mm, thereby giving an aggressive stance. Springs come in STI’s trademark ‘Cherry Red’ colour for instant recognition.)

