Indeed the sunny looks not very much updated since 1975, but for some reason it seems to have wider arches.
By the way scroll down a bit on this page and see Martin Pearson's Datsun:
http://forums.autosport.com/showthre...=&pagenumber=2
And another one from a post of the other forum:
http://img299.imageshack.us/my.php?image=pearsongp2.jpg