Morris Minor Owners Club

I'm replacing the front wings on my Traveller and wonder if there should be a beading inserted between the wing and the bulkhead along the top edge that the bonnet shuts down on --

Presumably - the flasher unit has correspond with the polarity for the vehicle wiring. I presumed that my Traveller was Positive earth as to the handbook wiring diagram but after burning out a replacement flasher I delved further to realise that the polarity had been changed to negative earth presum...