I just wanted to let others know the IS steering wheel works, just make sure you account for buttons. There isn't a back button and I have directional buttons on the right that are cosmetic only. Important note, the preface lift GS's air bag is a tad bigger than the IS's so the fit is tight.

What year/model is your car, which IS/RC steering wheel did you use, and are you completely locked out from navigating the cluster menus now?

I have a 2015 FSport, used a 2015 IS350 FSport steering wheel. Everything works, the stock GS steering wheel only had a display button that you use to navigate the dash options.

can you post a picture here? the only reason I'm still holding off is because of the airbag size / fitment and the heated steering wheel feature

I think that others have used RC steering wheels as I see their buttons are more squared. This was practically new and I got it for $180 shipped.

That is a pre-facelift IS steering wheel. The later IS and RC both use the steering wheel with the squared buttons and some light chrome.