That's a very reasonable price.
I like the fact that it's all brand new. No Doubt adapted from an Oem brand.
I have this on my cars
https://zpowersteering.com/?product=z-power-steering.
It works well, but there is a bit of play still.
If you think about what fuel we had in the 70's here in the UK, it would have been 4star leaded fuel witch was 97 Octane.
A Zed is a sports car, witch is about performance yes? As Huw says the higher octane will protect your engine.