Question 225/50R17X8 ET35 on A6 C6???

Hi guys. I was wondering if anyone had 225/50R17X8 with ET35 tyre/rim setup on his Audi A6 C6? I have A6 2007 sedan model with 2.4L V6. My standard setup is 205/60R16X7 and upgraded setup would be 225/50R17X7.5 ET35. The 3.2L FSI version had upgraded setup 255/35R19X8,5 ET38.
When checking on "willtheyfit.com" my upgraded setup would be slightly smaller and narrow on top then the upgraded setup of a 3.2FSI. I wanna put on some JR21 rims 17X8 in platinum red but the problem is that they don't make them 7.5 wide so I was wondering if 17X8 would fit or would that be too wide!? To me it looks like they should fit and that this would be the maximum I could go with. But I would really like to hear what other people think and if somebody already had such a setup on his A6 C6.
Greetings from rainy Norway