Hood insulation was part of the undercoating package. It was more for sound deadening than anything else. You couldn't order it separately. If the car came with full undercoating on the bottom side, it also came with under hood insulation. Most cars got the molded hood pad like the picture shows. Some got a generic "die cut" pad. It must have been a vender change. I pulled the original insulation off of my hood and don't remember it being molded at all. I put a die cut pad back on the car. I've since seen a couple survivor cars that also have a die cut pad. Most will tell you the molded pad is the correct one.
