R6n - Ive read reviews on some of the cheaper ones and have heard they dont fit aswell or dont keep their shape etc... Theres more to quality than material used such as workmanship etc.. For eg, a lot of rim manufacturers may use the same alloy however not all produce the same result
jawrgy - it attaches through four holes in the diffuser that fit into four holes underneathour bumper, if youlook at your car you should see them..