Upgrade to a Falcon front and stick with a 21 rear (I went dual and found I had less traction in the rear so took it off)
Cant beleive how long ago it was now but here is a basic guide I wrote on upgrading sway bars.
forums.turbobricks.com/showthread.php?t=148839
I have change the way I do the D mounts to the chassis now. Its simpler to get the sway bar including bushes and brackets, slot the holes slightly in the brackets then space it off the chassis rail with a bit of 20mm tube. I can get pics and give more details if you want to go down the falcon sway bar route.