Either put spacers in or weld in spacer panels.
Speaking of lifts, I'm psyched, I just ordered the A-arms/ball joints/idler arm brace from AC, hoping to get them and put it all in this weekend (along with new front shocks assuming those get here in time...otherwise they can be put in later I guess.)
Wanted to add...thanks Mosi for the illustrated install instructions, I'm sure I'll put them to good use!!!