Keep in mind, that if you wish for your car to still be road legal/road worthy, you'll also need to get the headlight washers, headlight motors, and all the sensors which need to be placed around the car (or whereever they go in the Polo GTI) to perform the auto-leveling functions (which is dynamic as the car is driving, hence the need for sensors).
Without the sensors/motors and washers, your car is illegal in Australia with Xenons.
Thus far in history, you cannot install Xenons cheaper aftermarket than from the factory. This may eventually change, but that's still the case at the Golf level at least...
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