I used two from The Roadster Factory and found them to be plenty high enough to replace the rust in the lower fenders. I can not remember the exact height. I would suggest that you call and ask which ever supplier you will use, what the exact length is for their panels. In fact I cut one of them off short because it went well beyond where I needed to go.
One caution that I found later was that the panel on the driver's side (either because of my fitment or their design was about 1/8 inch wider than the original. This caused a problem in getting the door to clear the fender near the bottom of the door. Before you paint the panel fit it to the car and make sure the door closes without hitting the fender. Then you can file it down a bit with no harm done. And not be like me to paint it and then try to remedy the situation.
Charley Fitch
