You don't have to get the springs from the people you get your dampers from. So long as the dampers are valved correctly for the spring rate you will be using that's what matters.
I have AST dampers and when ordered I just told them to supply springs to the specs I gave them (diameter, free length, and rate). I'll probably be picking up more springs in the near future to test some alternate spring rates.
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'11 370Z Nismo #528 Fast Intentions | Stillen | Motordyne | Uprev | CSF | Zspeed | Z1 Motorsports | AST | Swift | SPC | SPL | Whiteline | Hotchkis | Bride | Schroth | Robispec | Cusco | Nismo | Volk | Forgestar | Hoosier | RJM
'17 Titan Bone Stock
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