This info is from 2 different threads:
From top to bottom my B21 manual says, 1. Key Stop 5 amp, 2. Head Lights 10 amps, 3. Work Lights 15 amps, 4. Horn 5 amps, 5. Hazard Lights 10 amps. Number 6 is not listed and may well be a spare fuse holder.
#6 is Back Buzzer (optional) Found at this thread post number 2 and 4:
CLICK HERE
The fuse box location is shown at the following thread post number 9 (diagram not in english):
CLICK HERE