Of course this may be different for others but I take the same size and width in both the 5-65 last and the 333 last. I measure 11.5D to 12D on the Brannock, but I require an 11E for both the AE Park Avenue (5-65 last) and the AE Harrison (333 last). The 11.5D fit me in width on both lasts, but I felt the length was too long. When I went down to the 11D on both, they were too narrow at the widest part of my foot, and were both painful. 11E was my best fit even though I have a fairly low instep and can lace both of them nearly completely closed, but they are comfortably snug and I don't mind the closed vamp since I think it looks better to be closed or nearly closed on a balmoral oxford.