Kevin one of the Ames owners just gave me a courtesy call. He was very nice and understanding. He did say they have been selling this axle for ten years with no issues. He said the Firebirds are lug centric only and the hub hat protrusion makes no difference. Even the factory hub hats are tapered so it doesn't matter what wheel you run it would never be hub centric. He wasn't to happy my spacer question never got answered and that i never got my promised call back. He was very understanding on my spacer issue and agreed there should be note in the box of every axle sold and is working to do that Also he offered to refund my second bearing cost I just had to buy from Adam.I told him he has gained back my future business.