I thought for sure it was BLUE HAWAII, but I finally rented it and watched
it from beginning to end and I sure didn't see it.
Yann's database didn't mention the movie, either.
BTW, pics taken of said Car in HARD ROCK CAFE, Hawaii.
I spent about 10 min sifting through CADILLAC and ELVIS and AMBULANCES and HEARSES and WAGONS on that site, but no-go so far. Since this particular vehicle...