Or wings
Well... Some of the 1966 GP drivers had experiences with wings from driving in the Can Am series and watching Chaparral 2E's with their huge adjustable wing on top. Jim Hall is a bit vague about specific times, but from pics the 2C had a rear wing as early as 1965. And Chaparral wasn't first in putting a wing on a car to increase cornering speeds. The world was already changing...