The one on the left, the "thin" one is an early 1928 hub. Sometimes referred to as an "AR". The one on the right, the "thick" one is common 1929 thru 1931
The one on the left, the "thin" one is an early 1928 hub. Sometimes referred to as an "AR". The one on the right, the "thick" one is common 1929 thru 1931