I have no info for you, but I have looked for one of those for a couple years now! I was a cheap a$$ and did not buy the one on eBay last year! Kickin' my own backside now!
I went through my "deformative years" in Arnold, Ca., and still have many friends in the area. My family moved there in 1976. As an avid dirt bike rider, I never saw nor heard of anyone making these minibikes. A quick Google search did not help. Good luck and keep us posted!