Thought you might like to see this. ...not rocket science, but seems to be a fairly easy way to build a shorter, and adjustable, upper control arm for the t-bird IRS. The stock arm is waaay ugly, 10% too long and adjustable over a fairly small range. ...started with a 3/4"-16 LH rod end at the mounting point, added an 8" LH/RH threaded sleeve from JRMotorSports and made a clevis for the upright end of the control arm from a 1-3/4", 3" square tube with a 3/16" wall. ...drilled a 3/4" hole in one side and a 9/16" hole in each of the adjacent sides and then cut off the seamed side of the tube. ...finished the sides and ends on a belt grinder and deburred the holes. The clevis is attached to the sleeve with a 3/4"-16, grade 8 capscrew. The whole thing is adjustable +/- 1/4", accommodates the shorter (2"/side) axles and put together from commonly available bits and pieces. And, it is about half the weight of the stock piece and looks a whole lot better.
I know the lower control arm isn't going to be anywhere near that easy!
