The kit can be ordered with the brackets to weld to your own rear end. The springs are too long for a super low ride height and the fact that the cross bar sits under the stock trunk floor makes them sit in a lower position vs the DSE which has the shock cross member and mounts the shocks higher up so you can still sit low and have the correct travel. Sorry I'm not a suspension engineer but that is the thought in my head. Here are pictures of the Alston G-Link as Todd stated it is different than the older G-bar/Prodigy bar.
wow it does look like you get the same amount of lower mounting holes either way. the pictures i looked at showed about 3 different positions with a fab 9 and only 1 with the bolt on lower arms. must be old pics.