boy i hope they are the same shape because that it what I did. If the hole in the rear spar prevents aileron rubbing, then figured that the hole in the doubler plate should be the same. If not, then I screwed up yet another thing.
After I matched drilled and clecoed, I used a sharpie to trace the hole. I cut out the hole based on this shape. I rough cut by using a step drill, then used a #40 bit to drill a series of holes close to the sharpie line. After getting the bulk material out, I used a dremel with a sand paper wheel to clean it up. After cutting the rough hole, I clecoed back in placed and used a fine point sharpie to trace around the doubler. Pulled off the doubler and used a deburring wheel to fine tune.