The plate is 1/2 cold rolled steel. The mounting tab on the bottom is offset 1/2" using a piece of 1/2" square stock welded between the tab and the main plate.
When I had the plate cut, I made the tab 1/2" longer so that it would overlap the main plate. I bolted the main plate to a spindle and the tab where it went and then placed the piece of square stock in between and tack welded it. There are 4 separate beads of weld holding the tab on so I don't think it will go anywhere.
The bolts holding the rotor on are the same thread size as the studs that held the drum on but longer to fit the rotor.
