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What if the 1966 RWD GM V Platform (with lengths ranging from around 180-200 inches) became a global platform like the much smaller 1973 GM T Platform in OTL, eventually replacing other large RWD GM Platforms in the US domestic market for the likes of Chevrolet, Oldsmobile, Pontiac, Buick and Cadillac from the mid/late-1960s onwards (along with possibly others such as Isuzu)?