There are also two different spring perch heights on the 260z. You have to measure from the base of the tube where it joins the spindle,to the lowest point of the perch.Usually where the end of the spring end seats into the perch.The early model measures 9.25", the late model measures 9.75".This was how I came up with the difference in spring heights. Sorry I didn't want to confuse anyone. I had to find my notes going back to 2002. When i installed a late model spring perch with Motorsports springs the ride height was 0.5" to high. Hard lesson to learn.