Ford and Chevy Fixtures have one Bulb with two filaments (Controls all Functions).

VW Fixtures have one Bulb with two filaments and come with an extra Bulb and Socket that needs to be installed above the existing socket (VW Requires three filaments).

If you are replacing the Lucky style taillight assembly, both fixtures have the same foot print.

The lens is a different style them the Lucky and has one screw on the top and one screw on the bottom.