my suggestion is to stay clear of Australian Motors, they are dodgy and charge too much. It's BS they cant look it up...
Try Agostino Mitsubishi (local) or Ralliart NZ (bill there is pretty good, i bought some bits and pieces recently from him), they've always helped out and can look up these parts and give pricing. You might have more luck giving them a part number. (can look these up for you if your keen)