I went ahead and removed the old slapper bars and replaced the leaf springs on my 71 today. Biggest issue I'm having is that the center pin/bolt on the passenger leaf spring does not line up with the center hole in the anchor plate. This of course doesn't allow the anchor plate to sit flush with the axle. I attached a photo of the driver side which lines up decently enough to get an idea of what I'm talking about. The springs, anchor plate, and hardware are all brand new and center hole in the anchor plate appears to be correctly centered. The car does have a set of longer shackles which I'm thinking may be contributing to the issue. What do you guys think?