I have these for sale and I also have some Level II u-bolts and backing plates sitting around but they are 31-spline size so I don't think they will fit.
Hey Shane didn't you mention that you wanted to get a set of 1.5 inch blocks for when you do Expo leafs? You should trade your extra 2.5 blocks for Bens 1.5 blocks.
You send him the 2.5s, when he lifts and drop those in he send you his 1.5s. Even trade!