Most wouldn’t believe but the proportions are mostly the same! The 69 Mustang quarter panel is slightly shorter in the front. The door is concave instead of convex. So instead of having flat dooors on a 69 Fastback. We highlighted the style lines of the 68. Fabricated the quarter panel and A,B,C pillars. With having a shorter door because of the style lines. We then widen the car. So the flow of the car is awesome! Not bulky but widened tastefully!