I have pics of the front side (new one purchased from D&R when old ones wore out), can take pics of backside using my old one. The old one was the 1979 original. What year is your DS II? The early model years for the DS II (about 1971-73 or 74) had a smaller opening, but you could adjust size based on your boat (actually, until at least 1973, the opening had a vinyl-coated canvas cover that snapped on.
Anyway...... here are my pics: Unfortunately, they don't really show the slot for the locking tab too well, but I can try to show that with another pic or two if needed.