[JohnnyG]

My understanding is that both the GT convertible and hatchback have the same suspension excepting the k-member and some support braces- the different spring rates for the vert are due to the extra weight this car is carrying... furthermore, you might notice that most manufacturers do not carry high spring rates for the vert., this is because the vert has a weak chassis in comparison to the hatch, and a very high spring rate would result in twisting of the chassis.