1979 Dufour 12000 ct
I have a 77 Dufour 31, very happy with. Not familar with your model. I assume you are referring to 12 meters?. Try the following web site email@example.com and see if there is any info there. They were pretty helpful to me when I was looking for info on the Dufour I currently own. I was able to acquire a copy of the original owners manuel along with some articles and owners comments. They are very solid built boats.
Hope this helps.