your basically asking us to work out for you what sized spacers you required inorder to achieve an even offset all round so your track is not uneven from its std setting?
You have given us the rear offset, now we require the front rim offset which as stated before should be stamped on the back of the rim somewhere. Go find it out for us.
Based on what youve given us so far a 20mm spacer is required on the back, which is a common sized spacer to use.
Once you get the front then we can work out the required spacer needed to maintain the front offset so they clear and work for you.
From what you stated in the first post, thats what your asking. For a road car if the track is actually out of whack from stock its not really that big a deal, so long as its not way way out, which it wont be.