Chassis 1.33 vvt-i

Hi, I have planned that my Yaris will get a new chassis this spring. Not that the old one is broken (the car is not yet half a year old), but I would like the 17″ aluminiums to look good. Has someone ever done such a conversion and can recommend me some manufacturers and parts? Should you only change the springs or the dampers? I had planned that it would be about 50mm lower. Between the outer edge of the wheel box and the upper edge of the tyre So it should be loose inside. Looks pretty high-legged. Greetings, Neo