I checked my order.
5/8 X 31/4 Lippert Sku # 045-128969.
That is what I ordered after talking to Lippert.
I also asked him about using a grade 8 bolt and was told me that if I did that and it hits something it might do a lot more damage to with whole step.
He also told me if it was still under warranty the would just send out a total new set of steps.
2012 Georgetown 378TS Fire Mist
2008 Honda Fit
ReadyBrake™ Surge Brake System integrated with ReadyBrute™ Elite RV Tow Bar