So,
Eventually I've bought Racing Dynamics wheels and tryid to fit them on my 2004-E60 (fitment done without tires).
There was a minor problem with front wheels fitting as it touching front shock-absorber.

I decided to go with the wheel spacers for the front, to solve this issue.
In case if I'll go with 10mm spacers...or you can advise me other size...

1) Will 10 mm enough to make a space in betweeen the shock-absorber and wheel it self in the front?
2) What is the bolts size I must use or order for correct/safe securing of the wheels?

thanks

found the answer and probably this topic about bolt sizes for spacers will be interesting...follow the link, so u can define it!
http://www.ichibausa.com/whspad.html