What spacers to go with E46 M3

I have an e46 m3 on factory competition wheels. I'm looking for a 100% flush look. Nothing trashy. Just want the front and rear wheels to be aligned with the fenders. The car is reallly low right now, on gruppe m coilovers. I realize that I am going to have to raise the car up to achieve the flush look which I am ok with. I am aware that I can just measure the inside fender to the tire but I am just looking to see if anyone has similar tire/wheel setups and what spacers theyre using. I was thinking something like 18mm/15mm

Rear tires 255/35/19
front tires 225/40/19

15/10 u can try to fit 12 in the rear

I went 12 front and rear on lower eibach springs. 275 rear tires (michelin ps2's) and have just a very slight rub in the rear with a really big compression. 10 would be safer but 12 looks perfect, especially if you stay with 255's.