Tirerack shows that the OZ Raffaello that fits the IS F is:

Front: 19x9, 45mm Offset
Rear: 19x10, 53mm Offset

But Lexus shows 19 x 8 in. front / 19 x 9 in. rear. Can you put these OZs on IS Fs?

 

The widths and offsets sound reasonable (but conservative), but the
big question is "do they clear the brakes?"

The Tire Rack does a pretty good job test-fitting the wheels on new
cars, which is good because OZ no longer has a North American
headquarters to do so.

So, you can't call OZ, but you can call The Tire Rack.....
If they say they'll fit and they don't, I would imagine they
would take them back (?).