Ive had this problem with my sparco nt rims and i installed longer wheel studs, ordered through repco, thay arnt cheap though, think min cost me around $100 for a full set...
Consider getting hubcentric rings as well.
What model rims do you have?
Pics of rims and sizes and offset, im a bit of a fan of the old sparco nt and ntII rims, i have two sets of nts both ive had reconditioned and powdercoated black...