This was the companion car to the La Salle II roadster described below and shown on the same occasion. It was loaded with futuristic, practical items including a light, aluminum, fuel-injected, double OHC V-6 engine, independent rear suspension, brake drums cast directly in alloy wheels. Photo McC p.310. Noteworthy on this sedan is the so-called dog-leg "A" pillar and the compound-curve windshield extending far up into the roof area. The latter was featured again on the production Cadillac Eldorado Brougham models for 1959.
Source: www.car-nection.com