I'd go for upsizing the front bar first, as this will stop the front end diving over the outside front tyre & causing the body to rub. Pedders used to make a rear sway bar for the 1200, I used that with a big Selby front bar on my 1200 sedan. So there's Selby's, Whiteline at Minto, Jim Hunter Suspensions or K-Mac. I think the front bar I had was something like 25 mm, with an 18 mm rear bar, but these are long gone, so I can't measure them for you. Maybe you should consider going up in front spring rates, too. My Sunny sedan has something like 300 pound springs from Liverpool Springs, that certainly stopped the diving under brakes & around corners & helped with turn in. It also has a 22mm Whiteline Stanza front swaybar & a standard Stanza rear bar. A 120Y front swaybar & road springs just don't work on the track.