Stock wheels are 17x7 with a 47mm offset. The tires are 205/40/17. You will be able to fit slightly wider wheels and tires (but there is potential that they will rub if you go too wide or too tall).
From what I’ve read, most people upgrade their tires to 215/40/17 or 215/45/16. The way to read that is tire width/tire height/wheel size.
17.5x7.5 isn’t a wheel size. You’re most likely looking for a 17x7.5 size wheel. That’s wheel height x wheel width.
A 17x7.5 wheel can fit 215/40/17 tires as your widest option without rubbing or modifications. Spacers shouldn’t be required and are for looks, but if you get a low enough offset you won’t want spacers. The lower the offset the more the wheel will go out from the centerline of the vehicle. So if you go with a 40 offset wheel you are 7mm per side further out from the center of the vehicle. If you add a 5mm spacer you’ll be 12mm out, if you add a half inch spacer you’ll be way out.
I still run stock wheels but when I get wheels I’m getting 17x7.5 wheels with a 40mm offset. I’ll be upgrading my tires to 215/40/17 Dunlop Direzza ZIII. From what I’ve seen this wheel and tire combo will poke out slightly past the fenders and have a very flush look.
Tirerack.com is a good resource for finding stuff that fits.