Yes, OEM springs are side specific in front, NOT in the rear. If you got the taller '99 OEM springs, here is the data:
Part Numbers:
Front right 48131-35400 L=368mm
Front left 48131-35350 L=374mm
Rears ( same for both ) 48231-35210
Color Codes:
Fronts: Blue/Pink(left) & Blue/Yellow (right)
Rears: Green/Red
In any case, the longer one goes on the driver side.