My point for the sake of accuracy is two fold. Firstly, no mention of the coachbuilder was made what so ever, which is key for a bespoke car such as this one, and secondly, the car was sold as the Serra Dodge Boulevard.
I have a leaflet for it somewhere designated as such, from the 1972 Barcelona Motor Show, and the car was on the Serra stand, not the Chrysler Espana stand, clearly marketed as a Serra. This leaflet will take some finding, but when I do, I will scan it in. In the meantime, here's another picture of the car, taken from a 1981 movie called 'Linda.'