The specs I have were obtained directly from SSC/NTS. The lower damper mounting is slightly more inboard than the Sierra; the Sierra mounting is part of the upright, whereas the MX-5 version is part of the upper wishbone. Therefore, you would expect the open and closed lengths to decrease.
The rear spring, whilst we're on the subject, was specced at 7" open, 250lb. From what Nathan told me, Protech (who supplied SSC/NTS) have these specs on their database.
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