The double links isnt needed bud.. I have the UPR.. Its been good to me.. but I wouldnt buy it again for my car.. The links aren't hex or anything, just round.. So its a pain in the butt to tweak pre-load. Have to use channel locks to hold it still while you break the nuts loose and then fine adjust..
It also depends on how low your car sits.. if you want to slam it.. dont get it because where this style sits in the frame.. you will have clearance issues with the upper control arms hitting the arb.. especially if you have a upper with a "shoe box" like the UPR's.. and especially if you have a 9" with raised uppers. Or if you have the "relocated uppers" bracket..
The other thing I dont like about the UPR is.. the ends (bushings) they send are "roller bearings".. sounds cool right? But they arent near as strong as a brass bushing like most of the nicer ones. And the UPR doesnt have grease fittings on the ends either so you cant maintain it.. I drilled and tapped mine so I could install grease fittings. And lastly.. the UPR is a solid bar.. so it is heavy for one.. and weaker than a tubular.. Not alot of people are aware that a tubular bar is stronger than a solid bar.. there is more surface area (outside of tube and inside of tube).. ofcorse the thickness of tube makes a difference in this and a .10" thick tube wont be stronger than a 2" solid bar.. but a correct thickness tubing will be stronger, and alot lighter.
Im a fan of the kits that allow you mount the ARB on a bar, and send long unwelded links so you cut you links yourself. Either install it over the axle in the car and have a bar coming acorss there.. or have a bar between frame rails , behind rear, with it mounted on it.. There are some arb's out there that you can cut to length and mount it like the UPR straight to frame just wherever you want.. I prefer the arb to be behind the rear with the arms going forward. I also like the kits that have the plates to where you can unbolt the antiroll from the frame if you want.
Here is a few pics.. the first one is my UPR in my car back in the day.. Next one is a car just finished up last week. I can get you more pics if you want.
Heres the recent car.. kind of hard to see now that Im trying to show you.. Ill get some better pics of the setup if you want..