Perhaps you've already done this, so feel free to ignore my advice and leave it for someone else reviewing your thread.
I encourage anyone to educate themselves before pulling the trigger on a new suspension by performing a little research on their own first. It's your responsibility to be a good consumer - make yourself a little smarter before negotiating a new suspension with any business.
In this case there isn't a huge offering of aftermarket components for Mitsubishi's. ARB offers OME suspensions and Ironman has one available but since the demand for this make/model sometimes it isn't always available immediately on the distributor's shelves; it will come from overseas.
ARB has a
"vehicle application guide" on-line that you can precisely determine the correct suspension for your vehicle, which further allows you to research the best price by part number. Further examination of the website can give you even more specific details of individual components if you're up to that rigor.