I just noticed something strange on Rock Auto.

If I look up the shocks for the 2003 SLK320, there are more options. Specifically there is the option for Bilstein B4 shocks, which are the OEM shock for the car.

The Bilstein B4's aren't listed for the XF but the B6's are. All other available shocks match the SLK320's part number for part number.

Stands to reason that the shocks would be the same.

They are between $20 - $30 more apiece than the KYB's, and $20 - $30 cheaper apiece than the B6's.

What to do...….

Jared