Bilstein B6 on front should I also change rears

[brad]

If it's like a Polo / Golf / Octavia then you can DIY the rears in about 20 minutes per side without removing the wheels. You just need a floor jack & stands (for safety) & the correct sized tools.

Pedders - not my cup of tea.

Where in "Australia" are you? It's a big place.

King Springs & K-Mac in Sydney will do custom springs at any height or spring rate.

[T5 Double off road]

Rear Shocks are dead easy to change - 2 x axle stands - a hydraulic jack and a good socket set, even my wife could do it.