Hi guys, I am regasketing part of my 1991 911, 964, 3.6 L. It currently has the "rings" that line the head exhaust openings AND surface mount gaskets. Each of these gaskets have the exhaust port openings and the 3 bolt hole openings (per cylinder) and are separate for each of the 6 cylinders. I have been unable to locate these gaskets (surface mount to heads). Does anyone have a source or a part #. Everything I have found is 930 based and won't fit. Many thanks, Vettekliller