Bilstein B12 suspension kits combine matched dampers and springs. The Pro-Kit and Sportline versions offer application-specific fixed lowering, so the front and rear drop is determined by the selected kit.
Compare both axle values, the permitted axle loads and any strut-diameter or original-suspension restrictions. A factory-lowered model can have a different additional drop from the same kit. The product page identifies the exact application, included components and fitting conditions.
“Bilstein B12 Pro-Kit Suspension Kit – BMW Z4 Roadster (E85) – 46-181237” has been added to your basket. View basket
Not sure what fits, which approval you need, or what to choose next? Ask Garreth and Cameron. You’ll get a practical answer from people who handle the kit every day.