well, on the internet for both E53 and E60 is stated 5x120 72.6

what is hubcentric and how do i check it?

thanks

Okay the E60 specs sound good. I couldn't remember if the it was the E39 or E60 that had different hubs from the E53. It's definitely the E39. Hubcentric means that the hub is machined specifically to the opening of the wheel placed on the hub. If the wheel does not fit perfectly on the hub ( meaning gap between hub and wheel hip opening) then often you get vibrations on the drive. In your case the hubs you picked should work just fine.

yeah, all well except the bolts...E60 has 12 and E53 - 14... have no idea about the costs and where to get the long bolts for E53...

one question about the lug bolts.
if spacers are 20mm - do i need 45mm or 50mm long lug bolts?

i managed to find locally only 50mm ones, so far :(

yep and the e53 uses a different bolt thread too, i have to dig, I was able to find the lug bolts seperately from someone in maryland.

Lug bolts
 

Turnermotorsports should have the appropriate length lug bolts in the correct size for the BMW X5 E53

yey!

installed today. VERY HAPPY and first thought i had is why the heck didn't i installed spacers as soon as i bought the car?)

i now hope the stability wouldn't be affected for safety reasons.

so from that:

https://g-a.d-cd.net/6cd8212s-480.jpg


to this:
https://g-a.d-cd.net/5642c6as-960.jpg

^looks great! Rear only, none on the front?

yeah, none in the front.
thinking about maybe 10mm, but don't find them locally.