I think you will need spacers mate.
Caliper clearance is always an issue.
Personally Id source a set of wheels that fit the mitsi rather than use spacers to fit but thats your choice.
If you do buy spacers make sure you by top end quality ones otherwise you will end up with vibration through the steering wheel.
When I bought my EVO it not only had crap spacers on them the previous owner had also been at the back end of the spokes with an angle grinder to stop them fouling the calipers - shocking!