wheel spacer size?

[mikilla]

my rims are 18 x7.5 et 42 i have eibach springs with like a coil in a half cut with kyb gas-a-just struts, i cant stand how far in the rims are, I'm going to roll my fenders i want it pretty flush, what size spacers should i get? im running 225 40 18's and what size bolts should i get? i want it pretty flush some rubbing is ok like when i hit a big bump or something but don't want it extremely bad where it rubs just driving normal, please no flaming don't tell me not to do it, or that you dont think it looks good just give me some us full info. Thank you