This info is out a my 1985 FSM:
FRONT
Coil Diameter
All Models - 150 (5.91)
Wire Diameter
Left
CA20E GL Hatchback - 12.5 (0.492)
CA20E All Other - 13.0 (0.512)
CA18ET - 13.0 (0.512)
Right
CA20E GL Hatchback - 13.0 (0.512)
CA20E All Other - 13.0 (0.512)
CA18ET - 13.0 (0.512)
Free Length
Left
CA20E GL Hatchback - 320.5 (12.62)
CA20E All Other - 330 (12.99)
CA18ET - 330 (12.99)
Right
CA20E GL Hatchback - 330 (12.99)
CA20E All Other - 339 (13.35)
CA18ET - 339 (13.35)
Spring Constant (Spring Rate) N/mm (kg/mm, lb/in)
All - 21.0 (2.14, 119.8 )
REAR
Coil Diameter
All - 110.9 (4.37)
Wire Diameter
All - 12.9 (0.508)
Free Length
All - 355 (13.98)
Spring Constant (Spring Rate) N/mm (kg/mm, lb/in)
All - 22.6 (2.3, 129)