Buy some, simple as that....
or...at first why be so worried about it. If your renting a vehicle I would think they would put on the correct tires or have yuo sign something saying you understand what your doing...
BMW E46 M3 Black Too many mods
or all euro parts!!
ebay/craigslist verified/ m3post/e46fanantics/m3forum/zpost/bimmerforum