Steve, I'm gone for a week but if no one gets these measurements to you I will. I have a rough set that, I too was going to make two sets for myself. You probably know way more than I do regarding sunoco but you see the sign in your picture has a bolt on the inward edge of the arrows your sign has no hole. On my sign there is staining where it appears the arrows were on the outside of the sign. My arrows do not conform to the edge of the sign but are wider reaching all the way to the bolt i mentioned. I'm not sure how or why or when the change from outside to the underside of the sign happened. Perhaps you do. John