I don't know if this is what you're looking for, but this is what I have in my notes for the Boxster Spec springs which mount on PSS9's. They are also a 6" spring.
ID: 70mm (2.76")
Length: 152mm (6")
Usable Stroke: 98m / 4 inch
Max Stroke: 103.2mm / 4.06inch
Max Load: 825kgf / 1820lbs
Swift spring part numbers:
450LB: Z70-152-080 (448LB)
500LB: Z70-152-090 (504LB)
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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