20mm offset Beyerns on e53.. Lug nut length?

[Cadesto]

I bought these black Spartans off a guy that only used them a couple weeks on his X6.. At first I thought they were 35 offset but they say ET 20 on the back.. Anyway I ran the stats thru 1010tires do hicky and went out and measured and think they just might work perfect to the edge of the fender well very aggressive.. I'm assuming tho I will need longer lug nuts ?? Also some hubrings for the rears at least. The fronts are 9 inch 20's and rears 10 inch 20's.. Any help appreciated!!