So it is Peter Fonda. I thought it might be Captain America.
Seeing other replies, it’s good they didn’t hire “Billy the Kid” since he wore a fringed leather jacket, not looking protective, and a floppy hat, while the Captain wore a leather jacket like Peter Fobda, and a propet motorcycle helmet, though painted differently.
We should check Fonda’s biker movies, the ones made before Easy Rider, to see if he wore a helmet in those.