First of all thanks Kampala, yes i did, have found a picture of my model but can't see how to go further, i contacted them and they said to go back to the website but not sure how to put an enquiry in. It says to do this from where the model picture is but I can't see how you do this.
Secondly, thanks Jonny, mine is a New York (S), circa 1972 I think because that is the age of the car and I think the car came to NZ with the radio already fitted. Here is a photos attached of the amplifier and the radio. There are some numbers on the side of it.