This rear sway bar from H&R is designed to fit the 09-16 BMW Z4 sDrive30i/Z4 sDrive35i/Z4 sDrive35is E89 models. It is an adjustable 21mm 3-hole sway bar that helps reduce body roll and improve handling. It is constructed from high-strength steel alloy and is powder-coated for a durable, corrosion-resistant finish. This sway bar is designed to provide improved performance without sacrificing ride comfort.