I want to do a 12 & 15mm spacer kit on my 07 GTI and have had trouble finding info regarding the sizes/dimensions everything needs to be. If I do 2 different sizes, do I need 2 different lengths of lug bolts? (in this case 40 & 45mm I believe, correct me if I am wrong, I have the stock 18" rims) or would I be able to get away with 45mm lugs all around? also, for the MK5 the bolts need to be ball rather than cone shaped, correct? Thanks in advance.