General Motors option code

O4

O4: a General Motors factory option code reused for more than one part across 1967–1976 and 3 models — see the table for what it named each year, with installs and price where a source states them.

General Motors reused this code for more than one part over the years — read the "as named that year" column for what it meant on each row rather than assuming one meaning throughout.

3 models · 9 model years · 8 sources