I saw your other post and have replied there, here's a bit more. One thing I found, after owning 13 Volvos over the past 24 years and two 740's for 7 years and visiting various boneyards during all that time, is that there isn't a direct correlation between turbo/non and size of sway bar. The biggest Volvo bar I have seen I did get from a turbo 760, but have seen smaller ones on them also. I have seen medium bars on wagons but have seen smaller too. So try to have some way to ensure size when 'shopping'. I believe I have a good eye for these things but have sometimes been in error which I discovered when I applied a wrench of the size I wanted, or was comparing to.
Also, to some extent the link bushings can affect sway also, especially small initial movements like from crosswinds. I'm going to go to the urethane next.