Thanks TOWX.

On here I read that E53 rims have a center bore of 72.51, is that all E53's? I have a 2006 3.0i.

The after market 20's I purchased came with a set of rims but the seller tells me the measurements on my X5 are 72.56mm. The seller wasn't Tire Rack but a shop in EBAY.

Because of the difference in sizes from what I read here and what he tells me, should I resume I have the wrong hub rings?

I get shakes when I hit about 55mph.