Here are three pieces with basically the same profile dimensions, but don't agree with the Guide descriptions. The current 2003 Guide does not list the Green Gould piece as a 22.5 even though the profile is exactly the same as that of the Guide listing. The ESB piece has the correct profile of the 20, but does not have the shallow center hole. The unembossed piece is the only one that seems to correspond to the listing dimensions and profile as the Guide. All help is requested to "Iron" this out. (Pun intended, Charlie)