Our lights and harnesses have two different types of Deutsch connectors. This is normally determined by the current draw of the light. As an example, larger LED light bars (around 32 inches upwards), we will use a DT-P connector as it caters to the higher current draw. Smaller LED light bars/work lights will use a DT as it is a smaller profile and caters perfectly to the requirements of the lights power draw.
Below is a visual to help identify which plug you have/need: