that includes probably 20 faulty fuel pumps 1955 is the earliest known use on the series one Sunbeam Rapier. 1980 would be the last use on a Chrysler Hunter the ones in between have all sorts of unions and some woud  have the priming lever. The picture shows two examples these are not the exact fuel pumps I am offering.  Whatever  fuel pump you end up with this type can be repaired with a kit from a triumph TR4.