General Motors option code

UM1

UM1: a General Motors factory option code reused for more than one part across 1970–1981 and 4 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.

4 models · 12 model years · 7 sources