Which midsize car  of 1973 to 2005 used a shared platform with Pontiac 6000?
Pontiac 6000 The Pontiac 6000 is a mid-size car that was introduced by Pontiac in 1981 for the 1982 model year, positioned between the smaller Phoenix and larger Bonneville (previously the Le Mans). It shared its platform with the Buick Century, Chevrolet Celebrity, and Oldsmobile Cutlass Ciera.
AMC Matador The AMC Matador is a mid-size car built and marketed by American Motors Corporation (AMC) from 1971 to 1978. The Matador came in two generations: 1971 to 1973, and a major redesign from 1974 to 1978. The second-generation four-door sedan and station wagon models were classified as full-size cars and did not share the distinctive styling featured by the Matador coupe that was introduced in 1974.