We have endless amounts of questions through our site, and on ebay into which direction should you fit these grooved brake discs.
We recommend to normal road users that our discs should be fitted as follows:
This picture shows the 'Pattern' curving back towards the rear of the car. So this picture is the front drivers side. This acts less vigorous on your brake pads. Meaning, longer life of the disc and pad combination, but still increased braking performance.