You choose top, right or left side. Gath will factory fit special flat head rust proof SCREWS to your helmet to suit the ATC camera mounting bracket. The attachment screws are made from strong none corrosive materials and are tighty fitted to the helmet for a secure hold. Please note: Camera mounting bracket shown in picture is not included in purchase. The bracket is included with the purchase of a camera from any stockist or from Gath web store. Simple instructions for drilling the four mating holes into the camera mounting bracket are included with this purchase.