I think you will need at least a 20 mm spacer set to return to OEM offset. Much will depend on the size/aspect of the tires you choose.

Use this tool:

http://www.rims-n-tires.com/rt_specs.jsp

and put OEM info on the left and proposed/new info on the right and clearances will be shown both graphically and in the boxes below.

See also the Sticky "Wheel Spacers" here:

https://www.crossfireforum.org/forum...ad.php?t=25349

Lots of good info.