Originally Posted by ChrisSlicks

Okay that will be fine then. Wheel offset can be used as a tuning tool to alter the 'track' (width between wheels) and hence alter grip. Wider track from lower offset means more grip. With the stock wheels you have a little wider rear track which will keep things in check, if at some point you decide to go with a set of dedicated track wheels that have even offsets all around then you can decide on spacers.