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This part is used behind various door and window handles from 1958-1966:
1958-1959 door and window handles
1960 door handles
1961-1963 front window handles
1964-1966 front and vent window handles
This part is what the inner door handle mounts to. The spring inside is usually broken, resulting in the handle not returning after you open the door. Available for left or right, left side shown.