certainly hope we're not talking about rear bars! I guess we must be, because there's no way in god's green earth that a 1200 with a 24mm front bar would lift a rear wheel! 24mm is outrageous for the rear, and a massive overkill on the front of a 1200. Especially if it still has an A series engine and street tyres - you'd never get it to 'turn in' ever again!
I have a 17mm Whiteline rear bar on my race coupe, and have ground its arms down because its too stiff. I also mounted the diff brackets for the sway bar as far inboard as possible to soften its effect, and run the link pins a little loose to further soften the rear bar's effect on handling.
Swaybars should really be used for fine tuning after springs and shocks have been sorted out. Spend your money in those areas first, and then look at some more agressive front end geometry before considering having massive swaybars made. Adjustable castor rods to crank on a couple more degrees, and redrilled x-member to get a couple of degrees camber will make noticeable differences even on road cars.
I agree the 20mm 120Y bar is a much more sensible option for the front. I use one on my L series racecar, so if its not big enough for an A series 1200 on street tyres, something else is lacking...
And if you are looking for a rear bar, have a look at the wreckers under the back of KE55 corollas - some of these have rear swaybars that should be able to be fitted to a 1200, and are a much more sensible size.
remember that very small changes can have big effects on handling! Eg, loosening the rear bar's link pins less than 3 turns has changed the balance of my car from oversteering to neutral. A 5mm front ride height change also made a significant difference to the car's balance. So imagine what effect a 300% increase in roll bar stiffness will have!
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