Hi Jim, measurements on my car are 3 1/8" from the "O" to the edge of the body panel and the tail of the script lines up just under the lower edge of the tail light housings and 3 3/4" from the bottom of the "O" to the top edge of the belt line. Both quarters were replaced on my car but we took a pattern from the originals. I hope this is of help to you.
Chris