Caprice Rear Disk on C10 ?

[tommypic]

I am going with the rear disk setup on my build . I have read post about using caprice rotors , but no one has said anything about having to turn down the axles . I have a set of 5 on 5 wheels but center hole is smaller . I want to know if yall turn the ends down ? I am going to re-drill the axles from 6 lug to 5 on 5 . I am going to use caprice calipers and rotors . 1 more ? I cant find a parts house thats got the seals for the rear end either any ideas ?