On a T4 you can manually adjust the height of the front axle so you only need spacers for the rear. This kit consists of two spacers and will lift your T4 with 1 inch / 2.5 cm.
Mounting these spacers will allow you to mount tires with an at least 5 cm bigger diameter.
When you both put on these spacers and mount bigger tires, you will lift your syncro or 2wd with at least 5 cm.