Just for info, I previously owned a '68 SJ coupe that did come with the strips (which are stainless steel BTW). When I replaced the top on the '68, the strips were missing (but the holes were present). I was able to locate a set, but they were on a '65 Metuchen car. The holes were placed differently, though the strips still fit properly. My current Dearborn coupe also had them. That kinda covers the different plants. It is not intended to say that ALL received them, even from the factory. The quickest way to find out if a car came with them is to check the underside of the drip rail. There should be a series of holes (somewhere between 4-6), from the front to the rear. If not a whole lot of work has been done to the car, they should still be present. I have a copy of the installation instructions for dealer installed tops. The strips are included, though it's unlikely that most got installed. Once the strips were in (factory or dealership), there was a a flexible mastic applied over the top of the strips and smoothed. The material was available in white or black, for the respective top color. Using a quality silicone sealer should suffice to seal the top. Just apply and smooth prior to installing the drip rail moldings. This way you ensure the edge of the top is fully sealed.
My factory GT '66 Fastback (photo circa 1984, and I still have it!)