The LED board for the late TD and TF tail lamp is installed in place of the original metal socket, directly to the chrome plinth through the rubber body. Refer to the wiring instructions included with the LED set for connection details. Here are a few photos to help with the installation.
LED Light Boards, Late TD and TF, Positive Ground, Click HERE to order
LED Light Boards, Late TD and TF, Negative Ground, Click HERE to order