Hi i think you will find that the Mk1 in South Africa is only available in 4 door and the wings are different, more like the shape of a Mk11, not 100% on this anyone else no.
Anyway as far as panels go, i saw an advert in my local German and swedish from a guy who was selling new Mk1 panels, from wings to 1/4's i,m sure if you give the branch a ring they will look at there add board and give you the number.
GSF car parts, Badshot Lea, Farnham, Surrey
or if you go onto there web site you can get the number there.