Could it have been this one Russell>I remember a cut down 403 wagon to give a small ute back. A grey car, used to park at a business in Heidelberg Rd about 1968.
The problem with electrophoresis failing was a short term one, 1970, no buyers lost on it because Renault offered generous above valuation trade ins. As I've put elsewhere I met the technologist Dulux sent to diagnose the problem which was no more than not turning the drying oven off during the 7 minute morning tea break. Enough to make the paint in the box sections peel. Only did it to one car a day.