You could try, Autobedrijf C. Schouten B.V. Mitsubishi dealer Krimpen aan de Ijssel, have been there 20 years ago. Had always a good service. Came there after Mitsubishi dealer in Rotterdam went bankrupt.
Another option is Auto Edison in s' Gravenzande, 35 years Mitsubishi dealer. They also have a good reputation according to what i know.
And of course you could try to find the ralley specialists, but i am not familiair in that world.