I had the good fortune to play Sunningdale's Old and New courses last week. After my round I spent a few minutes looking through the club history book in the clubhouse and quickly read about the changes Simpson made to Colt's original holes six through ten. Apparently the current ninth tee used to be the sixth tee and the 10th green was the original 10th green but was approached from another angle. The current sixth (which I think is great), seventh, and eighth holes were completely new.
I didn't have time to go over the details in the book. Does anyone have more information about the original holes?