EBC 03-05 Buick Rainier 4.2 GD Sport Rear RotorsAll EBC rotors are made from OE spec grey cast iron, exactly as used on new car production and as many as we have tools for are BRITISH MADE wholly in our own UK foundry. Currently EVERY SINGLE ROTOR sold in Europe and the UK is BRITISH MADE and a majority of the designs specific to the USA are also BRITISH made. The British foundry is constantly expanding its in house tooled range but EBC like every brake manufacturer . does need occasionally to buy