The only help that I can offer is that I purchased a sender that was advertized as fitting a 55-59 NAPCO burb. It is 3/4 in. longer between the sender unit and the mounting flange and the horizontal section of the pickup is about 3/4 in longer. The part number on the box is 1518778. The mounting flange has two supports for the outside bit of the fuel pickup. The one that is used is two holes clockwise of the one that would be used for a pickup truck. John