Suspension Information
There are many spring options available for the 1979 - 1983 280ZX. In addition to the normal aftermarket springs available (Eibach, Tokico, etc) you can also use springs from other S130s. All S130 springs interchange with no fitment issues. Linear rate springs are generally better for performance but much worse in the ride department.
The following chart will show you the known rates for various springs.