Need help with springs

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I have an 04 Cobra Convertible and I want to get
it lowered BUT Eibach says I need kit 3594-140 which
is specific for 03-04 only .But factory rep says they
are still unavailable.She said people order 3590-140
but they are 99-01 only.Has anyone got any additional info
on this dilema.Oh she also said no eibach warranty avail.
if I put them in an off year car.THANKS

 

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