Technical Anybody have a Model A parts Book Handy?

What width are Ford Model A Piston Rings #A-6153-CR? Also what is the same number but a "ER" suffix?

 

That number isn't jiving on the Model A sites I checked.
All Ford piston rings that I can find have 6149 in the part number
Model A Ford Parts - Piston Rings & Parts (mikes-afordable.com)

 

An old 1928 -1934 Partsfinder Handbook I have, lists a 18-6153-CR ring (oil control) .015 over and a 18-6153-ER ring (oil control) .045 over, for V-8 motors. The 6153 number for Model A, has a GR, HR or JR suffix.