Unlike the 1967 Mustangs, all of which came from the Factory with a Driver's side Remote Mirror as "Standard" (unless it was somehow deleted), the 1968 Models only came "Standard" with a fixed Driver's side rearview mirror. However, the Remote Control Driver's side Mirror was available as a Regular Production Option (RPO), and should be noted on the Marti Report if ordered as such.
The Driver's side Remote Control Mirror was also available as a Ford Accessory, Part # C8MY17696B, as well as its matching RH "companion" fixed mirror, Part # C8AZ17696A.
Hope this helps,
Bob