This is the specs on a new set.
# Coil Spring Coils : 8.5
Coil Spring Free Height : 18.56" Driver Side/ 17.94" Pass. Side
Coil Spring I.D. : 4.03"
Coil Spring Load Height : 16"
Coil Spring Type : One Tangential End; One Square End
Design Load : 731 Driver Side /385 Pass. Side
Spring Rate : 585 Driver Side/ 325 Pass. Side
Wire Diameter : .812"