My first Buick! Car's in very nice shape except for rusted floor pans at drivers feet and feet of drivers side back seat. I understand this a GM "B" body; would any floor sheet metal fit from the long list of other GM B bodies (Bonneville, Catalina, Grandville, Impala, Caprice, Delta 88, what else?)? How about other Buicks like the Centurion or Electra 225? Convertible only or any 2 door? How about years? Any repro sheet metal available? Thanks.