Aerosus air springs replace the original air springs of your vehicle & offer you maximum ride comfort with high durability. Security, accuracy & quality of the product match the original part. This brand new rear air spring fits both left & right side of Mercedes Viano (W639) vehicles. Each air spring comes with an airline fitting. Aerosus air springs are made from high-quality elastomer materials & covered by a 2-year limited warranty & a 30-day money-back guarantee. The rings on the air springs are crimped using a special technology for dependable operation & leak-free performance. They are known for their superior dynamic properties as well as their long life & reliable durability. Our suspension air bags keep your vehicle level, even when carrying an uneven load. That means more effective handling & braking even in tough road & heavily loaded conditions. Features OE-quality air spring Maximum ride comfort High-quality OE-specified raw materials Airline Fitting Security & durability Safe load carrying capacity & stability Easy installation Thousands of satisfied customers worldwide