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One of guys from Japan said he had a rear 19mm on his car, said nice for the track changed back to the 17mm for the street. he is also using gs 28.6 front sway bar. I guess I get it right for the street. well balanced.
bcsc400
you must replace the bushing with the bar if bought new. I used the 430sc brackets
ebay for the JDM Lexus gs300 gs400 gs430 28.6mm front sway bar
ebay JDM lexus gs 300 GS 400 GS 430 front 28.6 perfect fit well balanced with the 2008 Stock ISF rear 17mm bar.
make sure you put the sway bar in correctly or you have a problem with your vsc/abs light in the dash.
So here is my question, if the stock ISF rear fits...then wouldnt the Fsport 2IS bar fit? We put on the 2IS fsport rear in the ISF world. So I would have to think they are both a match.