Arlie is right. You would not use the 68 grill as it has all the tabs for the running horse and chrome pieces. Instead, you order the 67 grill and make some modifications if using the Marchall foglight. First, you have to drill out the rivits that hold in the supports. Then, the Marchall brackets go in by cutting away a few small pieces of the grill. Then, the new brackets are rivited back into place.
Very easy to do. We thought the Marchalls looked better since they somewhat look like they float in the grill. My build date is June and I am sure that I was to have the Lucas lights.
Delta Bay is who we ordered from also and they delivered a good product. I found it extremely difficult to find a good pair of Marchall foglights. Finally, we met Brian B. who owns a GT/CS here in KC. He sold us a set of lights and was a real lifesaver.
Paul