Marchal lights were not an option on any 1968 XR7 GT Cougar. What do you mean by "Original"? Do you have an XR7-G?
Marchal lights were sometimes used on the XR7-G, apparently when the Marchal lights were banned by certain states. We think that AO Smith substituted Marchal lights on XR7-G Cougars in order to use Lucas lights on Shelby Mustangs destined for delivery to states that had banned the Marchal lights.