Well...
Here's what my friend, Dwight Hargrove, has said on this strange car:
"I think I may be able to shed some light on this cars' origins. Back in the day, the richest man in Canada Bud McDougald of Argus Corporation and Hollinger mines ordered a new '59 Cadillac. When they delivered it to his estate, he took one look at it and said "those fins are grotesque...I want them removed". So back to the dealer it went. I would assume they decided to modify it by changing it to the more modest Eldorado fins...money was no object so replacement fins were probably air freighted directly from Italy. I might be wrong about this car but it sure does seem to fit the story. By the way, there is a book written by their butler...called "The Butler". He was an acquaintance of mine and that is how I know the story about the car."