Found this, may be of use to someone.
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1991 Turbo
F: 130lb/in.
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linear
R: 209lb/in.
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linear
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1993
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(don't know whether NA or Turbo, is there a difference?)
F: 130lb/in.
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linear
R: 210lb/in.
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linear
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Suspension Techinique
F: 98-150lb/in
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(progressive) 1" drop
R: 179-235lb/in
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(progressive) 1" drop
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TRD
F: 168lb/in
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(supposedly progressive, haven't seen the range though)
R: 308lb/in
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(same as fronts) both are 1.0" drop
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Eibach Pro-Kit
F: 100-210lb/in.
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progressive, 1.0"
R: 140-303lb/in.
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progressive, 1.0"
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Eibach Sportline
F: 74-189lb/in.
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progressive
R: 120-348lb/in.
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progressive
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Tokico
F: 126lb/in.
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(supposedly progressive) 0.75"
R: 141lb/in.
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(supposedly linear, sounds way too soft) 0.75"
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H&R Sport
F: 230-260lb/in.
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progressive 1.4"
R: 235lb/in.
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linear 1.3"
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Tein S.
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Tech
F: 154lb/in.
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1.5"
R: 274lb/in.
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1.7"
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HKS SF5
F: 46mm, 1.81"
R: 25mm, 0.98"
RS*R Down SUS
F: 176lb/in.
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0.8"
R: 279lb/in.
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1.0"
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RS*R Heavy Duty Race
F: 201lb/in.
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0.8"
R: 346lb/in.
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1.0"
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kg/mm S21 Race
F: 165lb/in.
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46mm, 1.8" i think
R: 240lb/in.
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25mm, 0.98" i think
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Tanabe SUSTEC GF210
F: 2.3kg/mm=129lb/in.
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1"
R: 4.1kg/mm=230lb/in.
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1"
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Espelir Active GT
F: 2.8kg/mm=157lb/in.
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, 40-45mm, 1.57"-1.77"
R: 5.2kg/mm=291lb/in.
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, 30-35mm, 1.18"-1.38"
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Suspension Techinique
F: 98-150lb/in
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(progressive) 1" drop
R: 179-235lb/in
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(progressive) 1" drop
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Eibach Sportline
F: 74-189lb/in
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(progressive)
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R: 120-348lb/in
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(progressive)