69 z stripe
 

How far down did the stripe come down on the header panel to the in side

I am sure that varied on the painter?

Are you talking about the stripes wrapping around the leading edge of the front header panel?

Usually about a 3/16 +/- is blown under the edge with most painters passing along the front edge. I don't think factory header panels were much different and likely varied as Sam stated. Once the grill stiffener is in you can't see beyond 1/4" or so. Mine ended just before the grill stiffener when looking from underneath and I think this was normal practice.

https://i.ibb.co/HHy5WLW/IMG-3490.jpg

If you mean on the engine compartment side, on my VN car the black stripes extended all the way down to the bottom edge of the header panel.