What's up Mike? I found the following post you made back on 7/3/2006 at 01:34am regarding the Marchal lights.
Don - 68gt390
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To give you a quick lesson. All GT/CS cars built prior to April 26th, 1968 were equiped with Marchal fog lights attached to the brackets in the grill. They had clear lenses, not amber. Due to legal reasons, the Marchal lights were deemed to bright in California, so Ford issued a recall on all GT/CS cars, and replaced the Marchal's with Lucas fog lights. Not all owners participated in the recall. All cars produced after April 26th, were equiped from the factory with Lucas lights. These were mounted on top of round pedistals mounted through the grill molding. The example you supplied shows one driving light (Clear Lens) and one fog (Defused lens). The Fog light is correct for both lights. The recall cars were retroed at the dealership, and some Lucas lights were mounted incorrectly by not using the round pedistals. All GT/CS mustangs, regardless of production date, or fog lights installed still had the Marchal style fog light brackets in the grill. This was due to the fact all the grills were already made by Shelby automotive.
I hope this helps. Mike
ps, Be sure of your production date before buying fog lights, as all cars produced after 4-26-68 are only correct with Lucas lights. Also, the mounting studs are the same length. The picture is deceiving, but they are the same length.
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Mike Jewell
GT/CS Registrar
mikej@bigbytes.com