Originally Posted by vtmikev

Those adapters you post will NOT work. You will need H&R adapters that are made in 15mm and 20mm widths.....
TRAK+ Hub Adapter - 15mm or 20mm...Adapts your 74mm series hub to a 72.5mm wheel


These wheel hub adapters from H&R adapt your 74mm hub to the smaller 72.5mm BMW wheel. Made from high grade aluminum and are drilled for the stock bolt pattern. These are available in two thicknesses (15mm and 20mm) and longer wheel bolts are required.

Mfg Part# 3075740725 for 15 mm 4075740725 for 20mm

approx 130$ plus 10 bolts and shipping.

Anyway,

I would NOT do this!!!
I would buy the proper wheels for your X5.....I bought from BMW Dealer 4 Style 214 20" X10" (FRONTS) for my x5d, and with this set up, the rears still look like they can use 25mm spacers and alittle bit funny with out them. Tires are NOKIAN Hakk's 275/40/20's. 19's will look even worse with the black plastic fender flares...and the adapters will be a pain every Spring when they get "corroded" /stuck on..
If I was going to do this again, I may buy just 2 new fronts & 2tpms for those wheels and mount these in the rear with the new snows while using my original fronts with the orig TPMS in the front and just change the front tires every fall and spring. In comparison, the wider snows are slightly worse than 18X8" 255/55 18" HAKsnow tires I used on my old VW TOUAREG Hope this helps....
I could post pictures after Thanksgiving or the first week in Dec.....