I got them from Ireland Engineering.  Rear urethane subframe bushings, urethane trailing arm bushings.  I installed it all in 4 days, would have been 3, but I had a drive axle go bad during reinstall.

$164.00 shipped.

I'll have a full tech article written about this - how to do it.

The ride is stellar in a straight line now - it feels so precise, no squeaks, stable...very very worth the time it took to install.

bilstein sport shocks installed now - world of difference in the front, rear, noticably better, but feel soft.  fronts, great - just like everybody says.