For the price, I don't think adjustable suspension is always what's needed.
Sure, they're handy for the adjustability, but really who adjusts theirs often enough? Every set i've had has stayed at the lowest point lol. Except in the RX7, but slightly different application to a road car.
You can pick up lowering springs for under $300nzd these days, plus replacement Koni/KYB shocks aren't that expensive...
And really, they had no listings for V35 King Springs? I've priced them up through Repco...