An X5 would be a safe bet ...
What you probably seen was someone running 4 of the front wheels from an X5. IIRC they are staggered and the fronts are a 9". Which makes it a little easier to play with.
You won't fit a 10" on the front with out some serious fender work.
Plus they are heavy as all hell.
This is probably what you're looking for:
https://www.1addicts.com/forums/showthread.php?t=793230
& info on the wheel -->
http://www.bmwstylewheels.com/bmw/63