centering rear end

Now I have a question about wheel studs.I planned on changing them any way since the studs were flush with lug nut when tighten even with out spacer.Popped out one stud to measure knurl/length.I have .472 knurl/1 1/2" length.The closest I've found is a .480 knurl/2 7/8" length.Will I have to drill the axle flange or will I be able to press them in.Also do you think 2 7/8 will be too long to run dog dishes?These are stock axles.