Rubicon express doesnt make an 8 inch lift as far as I know....
Stay away from Skyjacker....and Rusty's....
Very few companies make an 8 inch lift....personally I would only trust one lift, and that's the 7.5" lift from TNT customs....and yes, I know its a RE based lift....
From what I'm guessing, its a RE 5.5" coil up front with either an ACOS or a 2" puck...then in the rear, 1.5" u bolt eliminator, 1.5" shackle, and 4.5" RE leaf pack.
Your other option is Full Traction, 6"...you could get an ACOS from JKS and the u-bolt eliminator kit from TNT, that would put you at about 7.5" as well....