The V platform, or V-body, automobile platform designation was by General Motors for the Cadillac Allante halo car. It was a shortened version of the E-body used in the Buick Riviera, Oldsmobile Toronado, and Cadillac Eldorado. The Allante was a personal luxury car, partially built in Italy, and sold in limited numbers.
General Motors also used the GM V platform (1966) designation for unrelated global sedans.
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References
GM V platform (1987) Wikipedia(Text) CC BY-SA