Could you please tell me if these rims will fit? They are staggered and have different offsets for front and rear. Also will they fit the tires I have on my 17" stock rims? Thanks for the help!

 

The offsets, to me, are backwards as to what would work best on the IS.
If the front is 17X8, then I would want that to be the +30 offset.
If the rear is 17X9, then I would want that to be the +35 offset

Your stock tire could fit the 17X8, but would be stretched on the 17X9.

 

I just checked with the seller and he said the specs are correct. Will they work with the car? Also I need two more tires anyway. Would anyone know ow the size of the tires for the rear?
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The eBay listing says they are not compatible with the vehicle...which is probably for the best.
However, technically they will fit, but honestly, I don't think you will like how they will look.
The way they staggered the width and offset it will make the wheels look almost flush to each other along the side of the vehicle, but if you look under the vehicle the rear wheels would be further in, slightly.
Me personally would look at something else...maybe an 18 inch or 19 inch rim. However, styling is subjective to each person, so I respect the fact that these are wheels that you like.

 

Okay thanks for the information. I am sticking with the 17 because I want to use the tires that are already on there. Would a different set of rims fit with 35 offset all the way around?

 

Those will fit...no problem.
You'll need a set of nuts and a set of hub rings...to take the hub from 73.1 of the new rims to 60.1 of the IS hub.