On 1985 Vanagons- the factory installed fuel tanks with both 48mm and 70mm openings. And on other years we have been finding that many fuel tanks have been switched with tanks from different years. When you order your replacement fuel tank- YOU MUST ORDER BY THE OPENING SIZE!! We cannot guarantee to know the correct opening size unless you measure it yourself. You should also consider replacing the filler neck seal, click here to view your options.