To date, 1977 and 1978 Rivieras are considered a rare find since it was only produced for two model years on the downsized GM B platform before the 1979 redesign on the FWD E-platform (there are two reasons why the B-platform was used—the existing 1976 B-platform was phased out for the downsized variant where RWD E-platform vehicles were produced on the B-chassis.