Nut M8 for mounting heat exchanger to cylinder head for Porsche 911 '63-'89

911 Carrera (3.2) 08/83-07/89
911 S (mech. injection) (2.4) 08/71-07/73
911 SC/911 Carrera (2.7-3.0) 08/75-07/83
911 SC Turbo (3.3) 08/78-07/89
911 T/E/S (not mech.injection) (2.0-2.4) 01/63-07/73
911/911 S/911 Carrera (2.7) 08/73-07/75
964 (3.6) 12/88-06/94
993 (3.6-3.8) 10/93-09/97
914/6 (2.0) 11/69-12/73