Bilstein B4 replacement series shocks and struts are your best option for replacing worn out, high mileage factory parts. Designed to function exactly like your OEM dampers and restore ride comfort, handling, and safety. Depending on your factory original parts, the Bilstein units come in mono tube or twin tube design. Bilstein has long been the industry leader in shock absorber technology and is trusted by many auto manufacturers to provide OEM original parts. The B4 series is great if you just want to replace old, leaking shocks at a great price. Engineered to fit and work perfectly, and provide a long, trouble-free service life. Give your vehicle a like new ride again with superior quality suspension parts by Bilstein. It is not recommended to use these B4 series shocks with aftermarket lowering springs.