My rear shocks have leaked and spring broken on one side it's a classic v3 sti saloon

Whats my best option, for replacement, are sti shocks different and are they available aftermarket, I'm guessing a kit ie lowering kit will be cheaper than individual springs

Thanks for the help
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KYB Excel-g struts:
KYB Rear Left Shock Absorber fit IMPREZA LEGACY 334110
KYB Rear Right Shock Absorber fit IMPREZA LEGACY 334109
KYB Front Right Shock Absorber fit IMPREZA 334255
KYB Front Left Shock Absorber fit IMPREZA 334256

or KYB agx
or Koni inserts
or Subaru inverted struts from the v5sti,v6sti & P1

P11L springs with bump stops/dust boots, to match excel-g's