"Due to vehicle fitment challenges, the 19" F-Sport Wheel and Shock Set are not compatible with the IS 250 AWD. Several countermeasures have been explored and tested without success. To resolve the wheel fitment issue, TRD will begin development of a new 18" F-Sport wheel. Additional analysis is being conducted on developing a new Shock Set to determine if a new product can mitigate the fitment challenge. As soon as more information is available, we will provide you with an update."
This is what we got from Lexus Eastern Office this morning. As of now the 19" rim and shock sets is only available for IS250 rear wheel drive and IS350.
Steve
Rallye Lexus