KYB Shocks & Struts Strut Boots Rear AUDI A4 2004-09 AUDI A6 2005-10 AUDI S4 2007-09 AUDI S6 2007-10 | SB115

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.