I installed the stock rear bar to my GT too. Turn in is way better and handling greatly improved. I didn't notice any increase in understeer or push.
As for the nuts to attach the bar to the axle: I used contact cement to glue them to the back of the bracket and didn't even need to hold them with a wrench to tighten. I did not use locking nuts however. I've checked tightness several times after many miles and they stay tight. I'm convinced that Chrysler must use the speed nuts or nuts on a clip as you've described with the Eibach kit, but the parts catalog does not show any part for that nut. After I installed mine I saw some large speed nuts in the nut and bolt department at Lowes, so I'm sure with some searching they can be found. As I recall the correct metric nut size is 10x1.5. As Cal Cruiser says, make sure you clamp the bushing retainer halves together and bend the tab down to lock together - this will make installation much easier. I bet it took Chryler about 10 seconds to do this install at the factory with the speed nuts in place!
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