i run 6mm spacers on my P5 with my winter wheels in order for the rim to clear the brake caliper. i do have the correct hub bore, but with the spacer the wheel clears the hub totally. i have the stock wheel studs and have had no issues. i also did the same on another car for 4 winters with no issues. just make sure the lugs are torqued properly.
sure its not reccommended, but its fine with me.