Can you get the new spindle retainers for the front of a 2wd when doing a rotor change at local parts stores? Why are the spindle retainers listed as "do not reuse?" Also, what grade of locktite do you put on the caliper bracket bolts to keep them from backing out? Also, do you put anti-sieze on the caliper bolts & new lugs on the new rotors? Thanks for any answers.