The left and right inserts are at least 1/4" off. Also the holes drilled into the inserts are not straight.
I'm probably going to find a shop to take off the damn inserts and build new ones properly. Longer too, so I don't have to use stiffeners.
Yes, my KMA was already rusting when I opened it, and it was sitting in my garage in the original shipping packaging (cardboard and plastic wrapping).