The trim on 1958 Buicks looks remarkably similar from the Roadmaster down to the lowliest Special. This is somewhat unusual for American cars of the Fifties and Sixties. The only detectable differences are the badge on the rear quarter panel and the name on the trunk lid.
Buick had previously used their infamous 'porthole' to differentiate models. But not always consistently. From 1949 through 1957, all Buicks except the 53-54 Skylark had them. All Roadmasters counted four each side and 55-57 Centurys and Supers also had four. 49-54 Supers, 50-57 Specials and 54 Centurys had 3 portholes. They were absent on 58-59 models but were reintroduced on 60 Buicks.
3 portholes
- Apollo 1973-1975
- Estate Wagon 1975-1976 (see 70-74)
- Invicta 1960-1963
- LeSabre 1960 to 1979 (except 78-79 Turbos)
- Park Avenue Ultra 2003
- Skylark 1961-1965
- Skylark 1975-1979
- Special (including Sportwgon) 1961-1969
- Wildcat 1962-1963 (see 64-70)
4 portholes
- Electra 1960-1980
- Estate Wagon 1970-1974
- Electra 225 Park Avenue 1981-1984
- Regal GNX 1984
No portholes
- Riviera all of them
- Wildcat 1964-1970
- Centurion all of them
- Century 1973-2005
- Skyhawk all of them
- Reatta all of them
- Roadmaster 1991-1996
- Regal (except 1987 GNX)
