Center bore is 67.1mm. If you would like to get
aftermarket wheels with the correct offset, you can use willtheyfit.com to compare them to my old setup, which is perfectly flush with the fenders. That website will show you how they fit.
19x10 +42 with 275/30/19 tire
19x9 +30 with 245/35/19 tire
I have a new setup where the sidewalls look way better and the car rides nicer, but i have a spacer in the front to get it flush, not sure if you want to run a spacer. Let me know if you want my new setup numbers.
You will also need centering rings if your new wheels have a center bore bigger than 67.1mm. So mine are 67.1 to 72.5mm centering rings.
You will also need to make sure your front and rear overall rolling diameter are within like 1% if you are AWD. That website gives you all the info.
I have Eibach lowering springs which are 1.4" drop and they still ride great. I don't know so much about coilovers.