To replace ANY part from FCP EURO you would purchase a replacement part, when it arrives you'll remove the part that is bad that YOU ORIGINALLY PURCHASED FROM FCP EURO, you will mail the bad part back to FCP EURO, they will confirm that it is a part they sold you, then they will refund your replacement part cost back to your credit card..etc.
now you know the real difference between that cheap $30 stabilizer and an FCP EURO Bilstein stabilizer....enjoy