Williams rubber ring part numbers by size

Williams numbers rings by size: 5/16 in 23-6300, 3/4 in 23-6301, 1 in 23-6302, 1-1/4 in 23-6303, 1-1/2 in 23-6304, 2 in 23-6305, 2-1/2 in 23-6306, 3 in 23-6307, 3-1/2 in 23-6308, 4 in 23-6309, 4-1/2 in 23-6530, 5 in 23-6310, 6 in 23-6429. The mini ring is 23-6552 and the bumper ring 23-6535; no Williams number is printed for 3/16, 3/8 or 5-1/2 in.