While replacing the brakes and rotors on my 2016 QX60, I found the brake caliper pins are different within each caliper. Specifically, one has a hard rubber or plastic seal at the tip. I have seen various suggestions and contradictory information as to which goes on top and which goes on bottom, both for the front and the rear calipers. It may be different for the front and the rear. Does anyone know what the factory manual says about this? Thanks.