#6 & # 50 Ford F150 both had it, as did 15 VW, 33 Muira and the King Size Police Mercury wagon.It was a good idea without the ugly lever, just press and turn, but Superfast axles were too thin to support the pressure of turning so that was the end of the line........Ther wher a couple others...#25 Ford Cortina, #18 Field Car I think had it, one or two more mighta had it...#6 Ford Truck maybe???
Your #8 Mustang is the only one that had the lever on the side though, the others you hadda press on the side of the model while it was rolling.
2 to 4 of the King Sizes from the late '60s also had Autosteer.
My K-21(?) Dodge Charger I got when I was a little snot has it.