One pair of Z65-203-012: 65mm inner diameter, 203mm in length with a spring rate of 12kg/mm (approx. 2.5" inner diameter, 8" in length with a spring rate of 650lb/in). Used during a coilover mockup and a test-and-tune session at the track.
and the other pair is Z65-203-010: 65mm inner diameter, 203mm in length with a spring rate of 10kg/mm (approx. 2.5" inner diameter, 8" in length with a spring rate of 550lb/in). This set was installed on a set of coilovers for a display and were never driven on.
Price: $300
Pictures of springs are on my Craigslist ad:
SWIFT Coilover Springs