There were three different decks outside of IMSA that were used on the 962. One for pre-'87 which was basically the 956 deck. The 1987 deck was the slim one you have posted. In 1988 they came out with the taller one to help with air flow over the rear wheels and out the back. If you look at period pics, the easiest way to tell is the rear wheel opening. If it is somewhat flat with the rounded corners it is the 956ish tail. If is more round with a hump above it in the top of the deck and a slim ending, it is the '87. The '88 tail had an opening that almost a complete circle.