sorry, guess I missed this thread earlier.
Anyone that takes the effort to put a sherical bearing in only one end will put it in the correct end. Check www.maximummotorsports.com They pretty much set the standard for mustang suspension parts. I was looking at the Pro3i (stangnet) lower control arms and they looked to be well designed with the correct bushings.
On the rear suspension, don't touch the upper control arms. Anything other than stock bushings will bind easier, which causes a snap oversteer problem, which will put you in a field Anyone selling upper control arms probably made the for drag racing, where they actually want suspension bind
In my opinion, get the adjustable lower control arms. That will allow you to easily step up to a panhard bar, which you could eventually use to upgrade to a torque arm.