Just as an FYI, I recently found out the hard way that not all 3 channel axles are the same. Some have a 1mm hub diaeter difference so that only certain wheels fit certain years. Quite annoying. I found this artical. Read the very bottom. Hope this helps.
They came out of my 01 ss if that helps? There in great shape, I just got a 12 bolt when I blew the pinon out of my 10 bolt, and striped the 10 bolt down so I have all the left over parts.