Have you seen the rear suspension of the Z?
The factory design places the spring independent of the damper, in its own bucket on a suspension arm. The damper connects to the rear shock towers up top, and mount to a different point below. Google 370z rear suspension for pixs
Swapping out springs is easy, I think u can just disconnect the mid link and the springs comes right out. If you have a lift you don't even need to remove the wheels I THINK (don't quote me)
The OEM bucket for the springs is much bigger than the SPL midlinks, which is designed specifically for a 65m ID spring
This is why you get all the parts and slap it on together
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