Simple trick, hang a €2 coin on a piece of masking tape from the wheel arch at the "12 o'clock" position. Grab a measuring tape/ruler and measure how much space you have to work with. Then decide on what size spacer, you could even try adding 10/12/15mm of cardboard to the face of your tire to be sure. Take turning angle into it by hanging two more coins at the "10" & "2" positions and turn the steering from lock to lock and see how clear you are from the coins.