Dean, I went with a little slimmer dimensions for a toned-down look. I believe 3/8" stripes and spaces in the order Peter mentioned with I think 1.5" letters. I printed stripe and Ford GT pattern pages on my computer in different dimensions, cut them out, and taped them on to see the width I liked. Don't forget to decide on the font you like. For instance some original letters were wider than they were tall and some were slim in width. I checked out all the "picture books" of originals and decided from those. They vary widely. Then you can specify to the decal maker exactly what you want.