Here's your cross reference. Your bike HAS the 5-fuse fuse box. As stated the other 2 are just spares and are not wired into the circuits. Each of these bikes uses the same fuse box. Reproductions are available.
PLEASE SELECT THE MODEL YOU WOULD LIKE TO VIEW
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CB400F A MOTORCYCLE, JPN, VIN# CB400F-1000006 TO CB400F-1038492
CB400F A (76) MOTORCYCLE, JPN, VIN# CB400F-2000001 TO CB400F-2008280
CB400F A (77) MOTORCYCLE, JPN, VIN# CB400F-2100001 TO CB400F-2104166
CB500T A MOTORCYCLE, JPN, VIN# CB500T-1000001
CB500T A (76) MOTORCYCLE, JPN, VIN# CB500T-2000001
CB550F A MOTORCYCLE, JPN, VIN# CB550F-1109886
CB550F A (76) MOTORCYCLE, JPN, VIN# CB550F-2000003 TO CB550F-2010866
CB550F A (77) MOTORCYCLE, JPN, VIN# CB550F-2100001 TO CB550F-2114871
CB550K A (77) MOTORCYCLE, JPN, VIN# CB550K-2000007 TO CB550K-2015308
CB550K A (78) MOTORCYCLE, JPN, VIN# CB550K-2100001 TO CB550K-2122082
CB750A A (76) MOTORCYCLE, JPN, VIN# CB750A-7000001 TO CB750A-7007331
CB750F A MOTORCYCLE, JPN, VIN# CB750F-1000002 TO CB750F-1015054
CB750F A (76) MOTORCYCLE, JPN, VIN# CB750F-2000003 TO CB750F-2022317
Buy one here:
http://www.vintagecb750.com/products/5/electrical/64/wire-terminals-couplers-fuse-boxes-fuses] [url]http://www.vintagecb750.com/products/5/electrical/64/wire-terminals-couplers-fuse-boxes-fuses[/url]