Like this,
absober+spring for chasis CA/CB or Lantis hb is suitable for any chasis BG/KF but ONLY the REAR one..
if i want to recommended to you the lowered spring it depends on ur own budget.You can try any brand from Eibanch or sparco,hotbitz or etc..
Ask for me,if i had no other problem mazbe i go for adjustable absober+spring.But if u ask for springs only try buy eibanch.This brand has team up with mazda to produce mazdaspeed hi-low adjustable absobers..Sparco and hotbitz also is a good brand.U can ask flatlander bcoz he also had used hotbitz spring b4 he change into adjustable shocks.Try ask him,maybe he had the springs left to letgo...