Unless someone has switched the boxes these 191's have a 19 mm" key"...
The bolts themselves are fine but I really dont want to have to carry a 19 mm lug wrench just for these lugs, as the regular lugs are 17 mm (or did the previous owner switch the lug nuts from 19mm to 17 mm....not likely...but then again ????
There does not seen to be a site that has the lug nut (key) size listed...
Something as "simple" as changing to locking lugs become a HUGE PIA.
What started all this is that there have been quite a few reports of wheels being stolen.

All X5s use 19mm bolts...so what you got appears to be the correct fitment for the X5. Not sure why yours are fitted with 17mm to begin with.

ABSOLUTELY, FOR SURE, POSITIVELY .... ALL 06 SPORT/PREM X5's....use 19 mm hex lug nuts ????
So that means that for some obscure reason the P/O (leasee) of my car changed 20 lug nuts to 17 mm....HARDLY LIKELY......someone is seriously mistaken
ps, I just went out and tried, 17 mm socket on wheel lugs..."check"
19 mm socket on KEYS of 36 13 6 773 191 "check"
It ain't me who is mistaken.......
Sorry guys....I havent the foggiest notion what's screwed up here...

See latest NEW post problem solved...