69 z28 stripe stencil kits
 

who is making the most correct kit for a flat hood car

I don't know that there is more than one maker.

I beleive the kit is the same for flat or ducted hood. From the front to the cowl grill, it is a straight line regardless of which hood.

I bought one from Rick's years ago, and it was right on the money for the rear stripes. I deviated from the front to match where my original stripes were on the cowl. But, the kit was right on at the front of the car.

Be sure to get the rear stripes in the '69 position. Common error.