I don't remember any O-rings on the big bolt rear axle, I'm confused about the description, you don't want a bearing race to have any "cushion" or movement that an O-ring might allow.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy