Riviera ...
... enough said
An Imperial only reminds me of one thing: some of the older ladies from around NYC that had moved to L.A. that my mom used to associate with when we were teens drive one. They had cat glasses, too. We kids would refer to them as the "magpies" because they'd squawk incessantly.
Looking back, Buick had nice grilles after the quad lamps arrived. It harmonized the models ... think Buick Regal coupe. The one below is a 1977 ... when car interiors were really something ... look at those blue S/R buckets.
Crazy that, in '76 or '77, they dropped the 231 V6 into base loss leader LeSabres IIRC.