Hi John,
Sorry didn't realise you had made two posts. I have the spares list and it has a drawing but doesn't show the horn in situ, however, my headstock has two tapped holes which I think must be for the horn. My headlight has two grommet holes in addition to the speedo trip reset, the main one and one below that. I checked my photos that I took before stripping the bike and although the harness was not original, the brake light wires exit the headlight shell through the second smaller grommet and done properly it will look very neat. Once again, thanks for the replies but please, don't disturb anything on you bike if you can't anwer by just looking
Regards Mac