Adjustable Roll Centers on S14 Chassis

[brainfood]

Is the only way to get the roll moment closer to the center of gravity on a lowered s14 to buy adjustable lower control arms on both front and rear? SPL Sells them with roll center adjustment spacers but I am know on some other cars they make spacers that fit on stock arms. Anyone know? I know battleversion makes weld on kits to adjust length on front lower control arms but I am not sure how this would effect suspension geometry other than possibly having effect on the camber curve but I am pretty sure thats the same situation and you need the spacers on the ball joint not a longer arm. Anyone that can explain this or give me some help it would be much appreciated.