The auto floor shift option was RPO M11 and is not shown in 67AIM, but does make note that the option was added to the AIM option list in 2-17-67. This was due to the introduction of the BB 396 w/ T400 without console
and had a production run of over 12,000 units. In 68 there where over 30,000 RPO M11 units produced. The 68 AIM Shows the shifter in detail and is correct as I have the original from my 68.