Back in stock as of this morning...
When you lower a T3 the rear camber angle decreases to the point of negative camber.
There is some adjustment on the trailing arms, but not much. So, if you run out of adjustment, these tapered shims go between the trailing arm and the rear hub pushing the camber angle back to where it should be, and allowing adjustment.
Obviously, theyre not a magic fix, and every vehicle is different... so you need to have the camber set after lowering. We cant guarantee they will get you exactly back to factory settings, but you'll be a lot closer.