A Lombardi enthousiast gave me a few screenshots of a movie in which a Lombardi Grand Prix does appear. Digging a bit deeper on the subject gave even more results, three to be precise. Just follow the link http://imcdb.org/vehicles_make-Lombardi_model-Grand+Prix.html

Looking through the pictures the car does not have a major role in the movies, the classification of the appeances is "background vehicle" or "minor action".

{phocagallery view=category|categoryid=205|limitstart=0|limitcount=0}