I'm cleaning up my office cause it's raining (it's "damp" in Northern California) and found this hole pattern to mount the deluxe door panel brackets on 64 and early 65 Mustangs that did not have that provision. The pattern was made on a piece of cardboard, rolled up and stored for a long stretch of time by the owner of a now closed Mustang shop. I scanned it for my files (needed to check out my new scanner anyway) along with some other stuff. I didn't check the accuracy but it will get you close enough if you have an early door to modify. There is a 6 inch ruler included to assist in reproducing the correct size.
Jim