drop spindles

[05Gibbs]

i have a 83 short bed and i have it lowered with a flip kit and springs and im wanting to take the springs out and put spindles. so i got a good deal on a set of belltech drop spindles 31200 is stamped on the back of them. the guy had them on a 76 half ton and when i looked them up it said they were for like a 70-72 or something. so will these work on my truck if so what all do i need to make them work? i dont want to start to put them on unless i have everything i need. diff rotots,callipers,a arms. ect
any help will be much appreciated. thanks bryce