I have been looking for just the rocker shaft tube for weeks and after a few false leads it seemed the part was just not available. Then I found what I thought was just the tube at Green Sales Company in Cincinnati Ohio. Imagine my surprise when the whole assembly showed up at my door in four days. This is a re-manufactured part...all the eccentrics. springs, little pistons, and the tube look new...nice fit on all the rockers. All this for $75.00 plus shipping. They had 10 more in stock. Ford part number C1AZ6563A.