hello experienced E53 owners.

im a new E53 owner and im sure you guys would already have the answers or can point me to a thread that already covered this? i couldn't find anything with a solid answer.

the question:

i have the 20" style 168 factory wheels (9.5x20 +30 front and 10.5x20 +45 rear) tires are 275-40-20 front & 315-35-20 rear, and in addition to the 4.8 fender flares. what spacers do i need for a prefect flushed fitment??

a lot of people are saying they have 20mm in front and 30mm in the back. but im not sure if thats with the flares or not... im assuming it is??

extra info: i will be on BC coilovers. if that makes any difference...

thanks!