sway bar
 

I was wondering since the SA have thicker sway bars would it be a cheap upgrade throw a SA front sway bar on my 85 FB GSL and leave the rear stock? If that'll work it'll be cheaper that spending 2 or 3 hundred bucks on a sway bar kit..

I could be wrong but I believe only the rear bar was thicker on the SA. And you don't want a thicker rear bar.