Hey guys, Rich PM'd me and ask me to take some measurements of mine. I hope this helps you guys.
Method: To compensate for the slope of the roof, I used a nylon string (no stretch), tied a knot on one end and colored the knot black. With two hands I held the string tight and put the knot on the upper edge of the drip rail, then pinched the center of the hole on the other end. I then held the string up to the tape measure to record the distance. I measured each one at least twice. I used the same method to measure center to center on the holes. Please note these numbers locate the forward mounting hole of each light.
This is what I was trying to describe, right hand is taking the picture obviously.. Parallel to the side drip rail.
And here are the numbers, you can click on the picture to blow it up to see it better. The red lines are center to drip rail edge, the greens are center-to-center.
If I were laying these out like some of you are, I'd use the center support bow on the inside of the panel to locate dead-nuts center. (maybe with a lightly-tapped punch or something) and then do my mark on the top side 7.5" back. That would locate the center forward hole, and you could easily work out from there with the above numbers.
Good luck!!
![Thumbs up :thup:](./images/smilies/icon_thumright.gif)