4 link rear end

who makes one? im kinda looking for just the 4 link without shocks ect i want to put air bags on it but heard horrible things about the airbagit kits(not sure if its the bags or the links that are junk) and the kelderman is kinda steep for my price range.. also anyone run bags on the front? looking at the kelderman and im wondering if you can go lower then stock on them i know the airbagit gives you +/- 4" with there kit