Hi!
Please pay attention, the page you are on is for Thule VeloCompact F, a towbar mounted bike carrier for cars with a Fix4Bike towbar only.
Below you see the difference between a Fix4Bike towbar and a regular towbar.
Fix4Bike towbar Regular towbar
If you can find two bolts underneath the ball head of your towbar, you are on the right product page and have found the ideal solution for your car.
Otherwise, you are probably looking for Thule VeloCompact that fits perfectly to a regular towbar.