The distributor out of my 1957 Ford ( not loadamatics) has a shaft that is 6 inches long. ( from the part that touches the block to the end of the shaft. My replacement from Napa ( 48-2808) is only 5 3/4 inches long and the gear is off a 1/4 inch. Napa ordered me a second distributor and it to is 5 3/4 inches long. I have a friend who has some old cores and they are all 6 inches long including loadamatics. Question is are these Napa distributors compatible or are they all packaged wrong. I know these units are rebuilt from different years and parts but I would think the length and gear should be the same length. Thanks Bill