hey, the cheapest thing to do is get audi spec (has the same length and drive so won't strip your screws) and you need to get the mushroom type. These are a little different then what you ususally put on, they are smaller and drive in from the bottom instead of the top. When I put my 22" rims on, i need the mushroom type, i cant use the regular ones cuz they are too big. That is most likely the same thing you have a problem with. You can get a set for about $50 USD. If you can't find them where you are, I can get them for you and ship them to you if wanted.
