According to motogrid that part was used on:-
CB750A A (77) MOTORCYCLE, JPN, VIN# CB750A-7100001 TO CB750A-7110560
CB750A A (78) MOTORCYCLE, JPN, VIN# CB750A-7200001
CB750F A (77) MOTORCYCLE, JPN, VIN# CB750F-2100011 TO CB750F-2111489
CB750F A (78) MOTORCYCLE, JPN, VIN# CB750F-2200001
CB750K A (77) MOTORCYCLE, JPN, VIN# CB750-2700009 TO CB750-2729534
CB750K A (78) MOTORCYCLE, JPN, VIN# CB750-2800001