Pulled this info off another site:
FRONT / REAR (KG/MM)
2.2 / 1.8 = nissan originals (54010-62Y05 front right, 54010-62Y04 front left, 55020-69C00 rear)
2.5 / 1.8 = whiteline (83109A / 83110) (progressive rate)
2.8 / 2.4 = nismo (soft) [discontinued]
2.9 / 2.6 = whiteline (progressive rate) [discontinued]
3.0 / 2.6 = espelir active gt (super down) [japan]
3.25/ 3.0 = rsr (ti2000) [japan]
3.75/ 2.7 = pedders (7025 / 2091) (~35mm low)
4.0 / 2.4 = king springs (kdfl-14 / kdrl-50) (progressive rate) (~25mm low)
4.0 / 3.0 = tein (oz fulcrum versions: qsn00-ezss4, japanese versions: gsn00-b1ss4) (coilovers)
4.0 / 3.1 = nismo (medium1) [discontinued]
4.2 / 3.3 = nismo (medium2) [discontinued]
6.0 / 4.0 = bc racing (d-06-va-gtir or d-06x-ra) (coilovers)
6.0 / 5.0 = nismo (hard) [discontinued]
7.1 / 5.1 = d2 (coilovers) [no longer supported in oz]
7.5 / 5.1 = g4 (coilovers) [discontinued]
7.1 / 6.2 = jic (coilovers) [japan]
8.0 / 4.0 = neotech (coilovers) [korean - via nz]
found this for you mate, these rates are all for gtir springs