Need advice on booster choice

Hi guys,

I need some advice on what to do with my break booster issues. I have std z32 300zx rear discs and calipers and R32 GTR front discs and calipers and I need to sort out a brake booster master cylinder system that will work with those calipers and (hopefully) fit right onto my 240k Skyline C110 1973. You can see the original booster fitted to the 240k was a joke and I swear it took power away from the brakes instead of giving it.

I've been informed that I could use a 240Z booster and a vertical mounting holes 280zx master cylinder 15/16ths ratio and that this would be a direct bolt on system that will work fine with the calipers.

Does any one know if this will work? or if there is a better system that will bolt up?

Also does anyone know where I could purchase the parts in Australia?

I would prefer to have a 1inch master cylinder as I'm worried about a spongy pedal but I've been assured that the 15/16ths master will work fine. Let me know your thoughts.

Cheers Andrew