This may be of interest to early 79 owners with a Solar Gold (50) vehicle. The date and production numbers of the 1978 version Solar Gold mix and the updated version of Solar Gold (50) after the 79 production had already started.
Previous references, or lack of, would indicate that the change could have began on day 1 of new model.
1978 Solar Gold 50 paint mixture change notice mid-79 production by
Ben, on Flickr