KYB Shocks & Struts Strut Boots Front AUDI A4 1995-10 AUDI A6 1998-10 AUDI A8 1997-03 AUDI RS4 2007- | SB122

You only need to order these if the boot / bumpstops on your car are missing, worn out, or need replacing.

Normaly, your original boot / bumpstops are simply reused. But you do have to remove them while changing out a unit, so while you are there already doing the work, it's easy to just slip the new parts on since you already have the car apart.